Venus to Mamoru!

Mamoru Yoshimura has just transferred to a new school where students are able to control the mysterious magical power called Beatrice. On his first day, he meets Ayako Takasu, who promptly confesses her love for him. Everyone is interested in Mamoru-kun because of Ayako-san asks him out when he just gets to school on his first day. Mamoru-kun is then introduced to the Student Council members.

With the Astral Fire weapon stolen, it's up to Ayako-san and Mamoru-kun to retrieve it. Luckily, this also gives Ayako-san some alone time with Mamoru-kun on their first date together. Mamoru-kun asks Ayako-san out before Ayako-san can say forget about me, and she is in great surprise of what he says.

Ayako-san and Mamoru-kun get to school the next day only to have problems like a banner announcing them going out and photos of them but on top of that a recording of the incident of the confessions. The Student Council decides to throw a welcome party for Mamoru-kun at Ayako-san's house, where he learns a little more about her past.

Mamoru-kun is asked to play the Prince in the play 'Sleeping Beauty' during the school festival; Ayako-san, of course, is asked to play the Princess! After being asked to be the Princess of Sleeping Beauty she, Ayako-san, faints from a cold or so we think.

Ayako-san falls ill just the day before the school festival. It's discovered that the Beatrice power within her is reacting to her puberty, and will take 3 days to normalize, which would force her not to participate in the play. Mamoru-kun offers to use his Beatrice powers to help, though there is a major risk involved. Will they succeed in their plan?

Ayako-san and Mamoru-kun spend less and less time together as the student council prepare for a skiing trip. Little do they know they are being followed by the PreuBen's Demon's sister, Emelenzia Beatrix Rudiger! When Ayako-san asks Mamoru-kun to come outside so they can talk, he does not know what she wants to talk about so he goes back to his room to get his present and comes to find out that his gift for Ayako-san was broken and he receives a hand-knitted sweater from her. What is he going to do since his gift is broken and he has just received a gift from Ayako-san?

After trapping the student council in an avalanche, Emelenzia-san challenges Ayako-san to a duel. Stating she has been sent by her brother to find out how weak Ayako-san has become since falling in love. Ayako-san gets knocked unconscious and Mamoru-kun runs over to Ayako-san and blames himself for her not being able to fight with all she had. Then Ayako-san and Mamoru-kun's Beatrice mix again and this time Ayako-san feels Mamoru-kun's feelings of trust in her and all his other feelings towards her. Mamoru-kun's gift is fixed by what Emelenzia-san thinks to be Mamoru-kun's Beatrice.

On the way back from their ski trip, the student council decides the stop at a hot spring. However, the president decides to play a game to see if they can deliver shampoo to the vice-president. The president wants Mamoru-kun to come and join in on the fun because Ayako-san is there, but the vice-president has set up traps to keep the boys from reaching the hot spring. Will the vice-president win or will the president win?

This episode is the start of Season 2. Ayako-san is invited to meet Mamoru-kun's family. Itsumi-chan has a problem cooking for some weird reason today so Mamoru-kun and his mom go out shopping. Ayako-san helps Mamoru-kun's younger sister, Itsumi-chan, out with cooking and learns a little more about the relationship between the two siblings. When Itsumi knocks over the curry Ayako-san runs and gets a rag, the one that Mamoru-kun sleeps with, then Itsumi-chan tells her that is the blanket Mamoru-kun sleeps with and it is partially colored yellow so Itsumi-chan puts it in the curry to make it all yellow.

Emelenzia-san asks Ayako-san to help her understand Japanese Culture. Since Ayako-san does not know what to try to teach her about the culture she asks the fellow female Student Council members to help her out with this situation. In the process Mamoru-kun and the guys from the Student Council and Ayako-san's servant go around town to show Mamoru-kun what girls like to do. At the last place they stop at Mamoru-kun walks into the room where the girls are having a fashion show and Ayako-san loses control over her feelings so she blows up the building. Finally Emelenzia-san transfers into Beatrice High School as a Study Abroad student. Emelenzia-san also entrusts herself to Mamoru-kun. Mamoru-kun smiles at Emelenzia-san and she starts to fall in love with him but Ayako-san does not want to share his smile with anyone so she runs away with him before it gets to far out of hand.

Emelenzia-san wants to break up Ayako-san and Mamoru-kun so her Onii-sama, brother, can have Ayako-san and she can have Mamoru-kun. So Emelenzia-san decides to help Mamoru-kun with Beatrice control but tries to seduce him while she is at it. While Emelenzia-san is trying to seduce him Ayako-san sees the person Mamoru-kun was supposed to be studying with so Ayako-san goes and looks for him, and Ayako-san sees Emelenzia-san and Mamoru-kun together. What is Ayako-san going to do?

The episode begins where the last one ended and Ayako-san runs away. Two members of the Student Council see Ayako-san and the vice president saves the other member of Student Council. The President of the Student Council goes to talk to Ayako-san and tells her that her hand-knitted sweater must be warm. She did not understand what he said. When Mamoru-kun sees Ayako-san at the door to the Home Economics Room and Ayako-san runs away and Mamoru-kun runs after her and tells her what Emelenzia-san has been teaching him and his reason behind it. Mamoru show's what he has learned and they both make up.

Johan, the nerdy person that Ayako-san dueled, has come to Japan to teach Beatrice control to some of the students at Beatrice High School, but in reality he has come to take Ayako-san away from Mamoru-kun by isolating him from the Beatrice and making him pass out. Johan tells everyone that Mamoru-kun pushed himself to far and passed out. After he gets done telling them all this he tells everyone that Ayako-san is coming back to Germany with him. What Will happen Next?

Ayako-san does not want to leave Mamoru-kun, but her Beatrice is calling out for Johan. Ayako-san asks for Mamoru-kun to say something, but he can't say anything at the time. So in turn Ayako-san and Johan start his research "Return to the Origin" by having Ayako-san touch the sphere it reacts in a negative way to where it puts the entire school at stake. What are they going to do?

Shione-san, vice-president of the Student Council, straightens her hair out from watching a TV program, but everyone else will not listen to her and start coming up with all of these far-fetched ideas. So Shione-san runs back to her house because she does not have to listen to the weird ideas. The next day she is back to her normal hair style. On the way to school, Ayako-san's grandfather calls and tells her that he is coming back.

Ayako-san's grandfather comes back to town and asks Ayako-san if she has a boyfriend. She denies it and her grandfather tells her that Johan told him that she did have a boyfriend. During an assembly Ayako-san's grandfather asks the entire student body if she has a boyfriend no one speaks up and just as Mamoru-kun is getting ready to speak up Abiko-senpai speaks up loud and clear that he is Ayako-san's boyfriend, and everyone laughs, but Ayako-san's grandfather takes him seriously. What are Mamoru-kun and Ayako-san going to do now that Abiko-senpai has said that he is Ayako-san's boyfriend?

Mamoru-kun and the Student Council go on a trip to while on the plane Ayako-san and Mamoru-kun make a plan to go to a cliff, this cliff is said that if a couple is to kiss on the cliff will be together forever, and kiss. They go to a beach and Mamoru-kun is asked by all the females including Ayako-san how they look but to ruin it Yagi-kun jumps in to the middle of it and scares everyone. Ayako-san throws everyone else in to the sea. After that she and Mamoru-kun are alone for a while and Mamoru-kun compliments her and the Vice-President and all the other girls gather around. Student President and Emelenzia-chan are sitting together and they all gather around them. While they are at the beach the all go have fun in the water and then Emelenzia-chan and Mamoru-kun fall into the water and Mamoru-kun goes and checks on her and comes to find out that she has lost hers swimsuit. When Mamoru-kun fell in Ayako-san rushes out to him. When they, Emelenzia-chan, Mamoru-kun, and Ayaoko-san, got back to the hotel they were going to go out and do something alone just to be interrupted. What will happen if they keep getting interrupted? Near the end they, Mamoru-kun and Ayako-san get stuck in a cave. What are they going to do?

The episode starts out with the flashback of when the man that could use beatrice, Ayako-san, and Mamoru-kun (Ayako-san and Mamoru-kun are kids). While they are stuck in the cave the man from the flashback goes and finds Student Council President and Vice-President. The Student Council follows him to where Ayako-san and Mamoru-kun are. The man tells them that they have to destroy these things called prisms because it eliminates the ability to use beatrice. As the Student Council members start destroying the prisms the beatrice slowly comes back. When Emelenzia-san destroys the prism that is in the flowing river, Mamoru-kun and Ayako-san are able to due away with the storm and clear out the rocks. Mamoru-kun discovers that the man from the flashbacks is none other than Misaki-san. After Ayako-san and Mamoru-kun get to Rainbow Cliff they share their memories that have come to lead up to an everlasting love and they also share a kiss. After that we see Misaki-san on the phone getting ready to get on the plane when we find out that he was talking to Johan-san.

Mamoru-kun and Ayako-san just got back from their winter trip and it is almost Valentines Day — this holiday in Japan is were the women give chocolate to the man they like—, but Ayako-san is acting weird while with Mamoru-kun. The Student Council is having a contest to see which of the female student council members can get Mamoru-kun's heart to beat the fastest. Abiko-senpai receives an email and it says that he can win Ayako-san's heart. Mamoru-kun and the Student Council President receive a bunch of chocolate. After Emelenzia-san gives Mamoru-kun her chocolate, Ayako-san tells Mamoru-kun and Emelenzia-san is acting like she is serious. Emelenzia-san then confesses to Mamoru-kun with Ayako-san standing there. What is going to happen next?

Mamoru-kun is wondering if he is going to have to hurt Emelenzia-san's feelings. Abiko-senpai receives his package and is celebrating. Emelenzia-san has her two henchmen help her right a letter of challenge to Ayako-san over Mamoru-kun. Emelenzia-san ends up getting beat to the extreme. Ayako-san talks with Emelenzia-san and tells her and asks her if she can take her confession as an open declaration of war. Just before the credits Abiko-senpai shows up and throws the gift at Mamoru-kun, and Ayako-san gets in the way. After the gift opens it absorbs the person's Beatrice from them. What is going to happen to Ayako-san.

We find out that Ayako-san has 1 week to unseal her Beatrice before she basically is dead because her body has fused with the Beatrice. Misaki-san invites her to his lab in Germany to help unseal her Beatrice but Ayako-san feels that he is trying to get her involved with his research. Ayako-san and Mamoru-kun go talk with Mamoru-kun's mom and sister about going to Germany. Mamoru-kun's mom is all for it, but Itsumi-chan, Mamoru-kun's sister, is not wanting him to go. Ayako-san turns down Misaki-san's invitation to come to Germany. Ayako-san collapses and tells Mamoru-kun to stay for his classes. Itsumi-chan goes to Ayako-san's house to visit Ayako-san but when she is getting ready to leave she sees Abiko-senpai tying a rope to a pole. Abiko-senpai and Itsumi-san sneak into Ayako-san's place. The strange person that was outside Ayako-san's house is now trying to attack Ayako-san. Mamoru-kun and Emelenzia-chan save Itsumi-chan and Ayako-san. What is going to happen after they leave for Germany?

Ayako-san, Mamoru-kun and the President all go to Germany by plane to get Ayako-san's Beatrice. They come across the Silver Maria and her henchmen who take Mamoru-kun away. Ayako-san and Johan-kun agree to help Misaki-san in his experiment Return to the Beginning. During the experiment, something goes wrong and cause the Beatrice to take form of a creature that seems to want Ayako-san. What is going to happen next?

Ayako-san gets absorbed by the Beatrice. Mamoru-kun goes to save Ayako-san from the monster which almost makes him disappear. Every country then is put on high alert and commence attacking the high spike of Beatrice. What is going to happen after Mamoru-kun saves Ayako-san?

Ayako-san and Mamoru-kun destroy the Beatrice and the School holds a funeral for them but something appears to be amiss. Then it later reveals that they were running tests on them after the last battle. Also some members seem to be graduating, but what will be the outcome of this glorious reunion?