The Quiet Guy is a Lustful Beast

Tsumugi Kume, a country girl new to Tokyo, seeks a sincere and pure partner after a string of bad experiences with dishonest men. She is immediately drawn to Toujou Kaname, a polite and mild-mannered student who seems like the perfect "herbivore" type. However, their initial sweetness quickly vanishes when Kaname reveals his true, aggressive nature, proving that his quiet exterior is merely a mask for a hidden, lustful side.

Mugi joins a prestigious intercollegiate dance group, only to discover that Kaname is a highly admired member who maintains a perfect, mild-mannered facade. After a tense confrontation in the dressing room where Kaname intimidates her into keeping his secret, a misunderstanding leads their leader to pair them together for training. Now trapped in a forced partnership, Mugi must navigate her relationship with the two-faced "prince" while dealing with his hidden, aggressive side.

Kaname continues his secret dance training with Mugi, but as rumors begin to spread among their peers, he is pushed into an intense dance battle that reveals a surprisingly aggressive side of his personality. Although he helps Mugi blend in with the group to deflect gossip, he continues to push her boundaries during their private sessions, leaving Mugi bewildered by the contrast between his mild-mannered public persona and his dominant true nature.

After losing her wallet and house keys, the female lead accepts an invitation to stay the night at the male lead's home. A moment of emotional vulnerability leads her to believe that his sudden tenderness is a sign of genuine affection, but after an intimate encounter, he abruptly reverts to his cold persona and dismisses her, leaving her feeling manipulated and heartbroken once again.

After returning her wallet, Kaname offers to help the female lead find a suitable boyfriend, demonstrating his uncanny ability to spot unreliable men. While she begins to reflect on her growing attraction to Kaname's gentle touch, he discourages her interest in a seemingly perfect candidate, Yuto, who is preparing to move abroad.

Tsumugi finds herself torn between the gentle kindness of Yuto, who invites her to a dessert tasting event, and the aggressive nature of Kaname. After an accident leads her to the infirmary, Kaname corners her, stripping away his quiet facade to mock her feelings for Yuto and remind her of their intense, secret physical relationship. Despite her hatred for his manipulative behavior, Tsumugi remains emotionally overwhelmed by the "beast" within him.

Yuto confesses his long-standing feelings for Tsumugi at his family's inn, revealing that he has been striving to improve himself just to win her over. As Yuto's hidden lustful side emerges during an intimate encounter, Tsumugi finds herself torn between her growing connection with him and her lingering thoughts of Kaname. Amidst this emotional turmoil, Tsumugi is forced to confront Kusumi, a manipulative man from her past, allowing her to finally reject him and reclaim her strength.

After a tense confrontation regarding Tsumugi's childhood friend, Kaname takes her to a luxurious presidential suite to confess his true feelings. The two share an intimate night and a romantic morning, strengthening their bond as Kaname encourages Tsumugi to distance herself from Yuto and fully commit to their relationship.