Rion is a timid girl who has always gone along with the crowd, unable to speak her own mind. Tired of her own passivity, she gathers the courage to attend a handshake event for the idol group PRINCE・K, where she meets Kanata, the member she admires. His encouraging words inspire her to change, and she decides to become an idol herself in order to get closer to him. On the day of her audition, Rion nervously prepares and accidentally runs into Sakyo, another member of PRINCE・K. An unexpected kiss between them triggers a bizarre transformation: her body turns into that of a young man. She soon discovers that kissing Sakyo causes her to become male, and falling asleep reverses the effect. Thrown into confusion, Rion ends up participating in a male idol audition instead of the female one she planned, and to her shock, she passes. Now she must live a double life as a male idol on stage while remaining a girl offstage, all while concealing her secret and navigating her deepening feelings for both Kanata and Sakyo. The story follows her chaotic journey as she pursues her dream, deals with the complications of her gender-swapping condition, and experiences the highs and lows of the idol world and young love.