After most pupils finish high school, they depart and rarely return. Yet at 25, Hana Natori is compelled to become a student again when her aunt asks her to. Her cousin Kaho Miyoshi declines to attend school, so the aunt implores Hana to step into Kaho's spot because they look almost alike. Coincidentally, Okito Kanie—an old classmate from her senior year—now teaches at the same school and spots Hana. With her disguise exposed, she fears Kanie will reveal her ruse. Instead, he unexpectedly kisses her, and she realizes he has a different plan.
The unexpected kiss stirs mix of surprise and curiosity, prompting Hana to reconsider her motives. She wonders if this connection could change the course of her life and whether she can keep worlds intact.
