Kuroda Koutarou, the newly appointed adviser for the Felias Girls Academy lacrosse club, finds himself at the mercy of his eccentric students after accidentally walking in on them changing. While later searching the clubroom for his lost house keys, Kuroda is caught by the mischievous Kise Matori, leading to a heated confrontation that quickly spirals into an unexpected and intimate encounter.
During a grueling beach training camp, Momoi-san struggles to suppress her vivid and intrusive sexual fantasies. After fainting from the heat and exhaustion, she experiences an intense erotic daydream involving her teacher, which leaves her feeling strangely refreshed and focused. Now convinced that her "sickness" is under control, Momoi begins to wonder if her newfound giddiness toward her teacher is actually love.
After Kuroda-sensei is absent for a week due to a cold, team captain Kumiko visits his home to check on his well-being. While nursing the sick teacher, she becomes overwhelmed by his scent, leading to a passionate and surreal sexual encounter. However, the erotic experience is revealed to be a vivid dream as Kumiko returns to the club to lead her teammates through the training regimen Sensei prepared for them.
While Matori-senpai shares explicit sexual advice with the lacrosse club, the sheltered Sakura remains blissfully ignorant about how babies are conceived. However, this innocence quickly turns into a daring curiosity as Sakura decides to "experiment" on her coach to understand the acts she has heard about. As the coach struggles to avoid the fate of a disgraced predecessor, he finds himself trapped in increasingly compromising situations with his students.
Following news of another teacher's dismissal for misconduct, the lacrosse club holds a "condemnation party" for their own lecherous coach, Kuroda Koutarou. Rather than seeking his removal, the girls decide to share him in a secret arrangement, leading to a chaotic series of sexual encounters that bind them all together as accomplices.
Seeking to bring their idol Aya into their secret arrangement with Coach Kuroda, the lacrosse team members plot to win her over through sexual pleasure. Although Aya initially views the coach with utter contempt and threatens to report him after catching the group together, she soon finds her own desires awakened as the girls work together to seduce her.