Keikenzumi na Kimi to, Keiken Zero na Ore ga, Otsukiai suru Hanashi.

Ryuto Kashima is a reserved high school student who secretly admires Shirakawa Runa, a popular and attractive classmate with a history of relationships. Despite believing she would never consider him, he ends up confessing his feelings to her. To his surprise, she agrees to be his girlfriend, citing that she is "available." She quickly invites him over without hesitation. The two differ greatly in their social circles, interests, and past experiences, but they gradually grow closer. While this is not Runa’s first relationship, it marks the beginning of many firsts for both of them.