與辣妹的外表相反、未曾有過初戀經驗的女高中生藍原柚子，因為母親再婚的原因進入大小姐們就讀的名門“藍原學院”就讀。但是轉校的第一天，藍原柚子就偶然目睹了認真的學生會長藍原芽衣與帥哥班主任激吻的場景。從母親那裡得知到芽衣變成了義理妹妹，然後就這樣在同一房間裡生活？

同居一室的晚上，柚子被義妹奪取了初吻。從這之後，柚子就時常關注著芽衣，而芽衣卻好像什麼事情也沒有發生過一樣。那樣的情況下，身為藍原學院理事長的芽衣的祖父將芽衣帶回了自己的房子居住。柚子忘不了在接吻時芽衣的眼神裡所流露出的悲傷，柚子決定前往理事長的豪宅已確認芽衣心中的真實想法。

Yuzu realizes her feelings for Mei are love, and cries. Wanting to follow her emotions, Yuzu visits the chairman's office to try and reclaim her relationship with Mei after she went away. However, she discovers the chairman suddenly ill?! Mei comes rushing to the hospital when she's called, learning that Yuzu worked hard to save the chairman, and then she begins to open up about herself...

After confronting Mei with her feelings and kissing her in the chairman's office Yuzu isn't able to face Mei and agonizes over it. Meanwhile, the student council vice president who's also Mei's childhood friend, Momokino Himeko, becomes suspicious of what happened in the chairman's office and meets with Yuzu on their day off to discuss it. There she tells Yuzu, "She's incredibly sad. As sad as she was when the current chairman, her father, left her," leaving her in shock. Yuzu's weakly walking to the station home when Mei appears before her...

After Himeko declares, "I've crossed a line with the president!" Yuzu gets competitive and wants to cross that line too. At school, both compete to see who will eat lunch with Mei, but Mei turns them down and leaves them equally crestfallen. Meanwhile, Harumi reveals she has four tickets to an amusement park and proposes that they invite the president to all go together...

Mei's father, Aihara Shou suddenly returns home. While Yuzu is surprised to meet him for the first time, she explains to Shou how hard Mei's been working for the academy. However, Mei screams at her to stop when Shou just silently averts his eyes with hesitation. Shou tells his daughter, "I'm not returning to the academy." Yuzu is unable to say anything as Mei runs away to their bedroom, and that night she tries speaking to Mei again.

Mei and Yuzu study together at their house so Yuzu can place in the top 100 on their exams and keep their grandfather happy. However, after their kiss of mutual yearning, Yuzu can't concentrate at all. Steeling her resolve she asks Mei what that kiss meant only to get coldly brushed off. Feeling depressed, Yuzu heads to an arcade with Harumi, but her mind's distracted. There, she reunites with her childhood friend, the second year middle schooler, Mizusawa Matsuri.

After accepting Matsuri's forceful invitation to hang out after school, Yuzu takes Mei with her to the station where Matsuri's waiting. Matsuri greets Mei with a cold stare, having believed she'd meet Yuzu alone, and then she grabs Yuzu's hand and happily drags her around the shopping mall. However, Yuzu's constantly thinking of Mei, which upsets Matsuri until she finally calls Yuzu cruel and runs away from the two of them.

With her dislike of Yuzu and Mei's relationship, Matsuri uses the secret photo she took at the shopping mall to blackmail Mei into fooling around with text-pal on Christmas. Meanwhile, Yuzu knows nothing of this and struggles to bake a cake for her first Christmas together with Mei. While her excitement builds, Mei comes home and breaks the news that she won't be able to join their Christmas Party due to student council work...

While Mei was able to accept her feelings on Christmas night, for some reason Yuzu couldn't respond sincerely. Ever since then the two have barely exchanged words and their relationship only grows more awkward... More time passes until the school field trip draws near. On the day of the trip Yuzu oversleeps and dashes to the station, but she's too late to catch the train. While she's feeling depressed she runs into a pretty young girl, Tachibana Sara, who also missed her train.

Yuzu promises Nina that she'll support Sara's love with her, but after learning that the girl of Sara's destiny is Mei, she can't help but feel shaken. Nina ignores all the attention she's drawing, desperately holding Yuzu back to keep her from going to Mei. During their conflict Yuzu gets a call from Sara on her smartphone, saying "There's something I need to give you." She quickly races to the overlook, but Mei isn't there, only Sara greeting her with a slightly sad smile as she returns the student ID Yuzu dropped earlier.