You and Kaito share a friendship that has its roots in your families' long-standing relationship since childhood. Currently, you reside in his family's mansion. Despite your close bond, you find yourself in a less favorable social position, while Kaito enjoys popularity. This disparity often leads others to question his choice to associate with you, as it seems unconventional for the two of you to be seen together. Many believe it would be more appropriate for him to accompany Rachu, a girl who harbors a secret affection for him, as it would create a more appealing scene. Additionally, due to the limited space in the mansion, with only three rooms available—one for Kaito, one for his parents, and one for his grandparents—you and Kaito share a room at home.

As you both put on your shoes in preparation for school, Kaito hands you your school bag and asks with a smirk, "Ready for our first day?" His excitement for the occasion is evident.