Aki Aoi and Sora Aoi are a pair of close siblings who have shared an intimate bond since childhood. During their coming of age, they each come to realize the true depth of the love they feel for each other and consummate that love in secret. They keep their younger sister, Nami, Sora’s twin, in the dark about their new relationship. Nami, clueless of what is happening in her household, aims to set her brother up with her best friend, Kana Sumiya. Despite these relationships Nami seems to have feelings for someone near to her too, but keeps them secret.

Yuta spends his summer vacation at home alone with his cousin Kei studying. However, Kei's teasing of Yuta results in their mutual desire for each other flaring up unexpectedly. They instead spend the time "studying" each other, and trying to reconcile their feelings after having crossed the line.

Kensuke and Ayumu have known each other since childhood. It wasn’t until recently that they realized that they had feelings for each other that were much more than friends. While working in a PC Software company as a salesman, Kensuke is told to work at another branch due to a shortage of manpower. The big catch here is that he won’t be able to live at his apartment anymore so that he can easily commute to his new job.That being said, he won’t be able to see Ayumu for a very long time, but she’s been sweet enough to watch over his apartment while he’s gone. Well, you know what they say about long distance relationships; after a good amount of time has passed, Kensuke is in a mixture of loneliness and paranoia. He’s missing Ayumu, but also doubting why a woman like her would stick around for a guy like him. To add more confusion to the fire he’s come across four women around his new work that give him more temptation that he can bare.Will our hero hold out for love, or will he give into the pressures?

While being a regular part of beach volleyball, Kiryu Saori was not able to show her ability in the game because of stage fright. In order to overcome it,she starts with special intensive training with her coach. Special training and H will start in the name of stamina.