Haruki, the main character, establishes the "Virgin Alliance" with his fellow university students Kou and Shunta. He harbors feelings for his classmate Suzuka but finds himself becoming attracted to Misaki, a younger girl, due to her sincere nature. As Haruki navigates his emotions for both girls, discovering Suzuka's hidden traits strains his bond with Misaki. The story follows the romantic journey of this inexperienced college student.