Yuma is a 27-year-old woman who works as a tutor at a prep school. She is bisexual and currently single. With her mature, big-sister charm, she's popular among students and often becomes their confidante. One day, a student of hers, Kotono, a third-year from ● High School, comes to her for relationship advice. Yuma always listens sincerely, but during their conversations, she begins developing feelings for Kotono. As a thank-you for the advice, Yuma invites Kotono to dinner. Sensing an opportunity, Kotono takes the chance and ends up inviting herself back to Yuma's place. The story unfolds as mutual feelings gradually blossom between them.