Hensuki: Are you willing to Fall in Love with a Pervert, as long as she's a Cutie?

In a high school setting, Keiki Kiryuu's life takes an unexpected turn when he discovers a love letter accompanied by a pair of panties. The letter's cryptic message and the intimate item leave him bewildered, but also hopeful. The only clue to the sender's identity is the group of girls who helped him clean the Calligraphy Club room that day: the laid-back club president, the foreign library committee member, his tsundere classmate, and his own meticulous younger sister. Driven by a desire for romance, Keiki embarks on a quest to uncover the truth, navigating the complexities of his relationships with these unique and potentially unconventional love interests. The series explores themes of love, identity, and the awkwardness of teenage relationships, all while presenting a mystery surrounding the identity of the panty-loving admirer.