Aitsu no Kanojo

Riku Ishizuki, Shizuku Minase, and Takuto Sorano have been inseparable since childhood. When Shizuku and Takuto begin dating, however, Riku becomes conflicted about his feelings. With vivid thoughts of Shizuku clouding his head, his heart only grows more tumultuous after she starts making advances toward him. Unsure of her intent and fearing it will shatter the trio's friendship, Riku tries to keep his distance from Shizuku, but she is hellbent on becoming more intimate with him.

As he struggles to control his conflicting emotions, Riku wonders if there is more meaning to Shizuku's seemingly irrational actions.