Mr. Aoi is adolescent.

High school student Hibari is secretly dating her biology teacher, Mr. Aoi. Because their relationship crosses the boundaries of a typical student-teacher dynamic, it must remain completely hidden from everyone around them. To protect their secret, they have established strict rules: no exchanging messages, no phone calls, no dates, and no kisses. Any behavior that resembles a normal romance is strictly forbidden. Even a single rumor about their connection could force them to break up immediately, leaving no room for error or carelessness. Despite these heavy restrictions, their feelings for each other are genuine and deeply cherished. Both Hibari and the serious Mr. Aoi understand that safeguarding their bond requires constant vigilance and restraint. Every passing day becomes a test of their devotion, as they navigate the tension between their intense emotions and the rigid limits placed upon them. This pure yet constrained love transforms their daily lives into an emotional journey filled with heart-pounding moments, as they strive to protect a fragile romance that the world can never know about.