Even after a year of engagement, Sayo still hasn't been able to fully reciprocate her fiancé's feelings. Though she can sense his kindness and affection, the relationship feels one-sided, leaving Sayo emotionally unfulfilled. Hiding a desire to never grow up, Sayo's body naturally transforms every night after midnight. Wandering the streets in a bunny outfit, she becomes an almost dreamlike figure—her appearance symbolizing the hidden wishes deep within her heart and the unresolved emotions she still carries.