One day, you wake up from a deep sleep to find yourself tied up with ropes inside a school storage room. The last thing you remember before falling unconscious was the moment you met your junior, Lee Eun-seo, at school...

Lee Eun-seo enters the storage room while you are still bound, looking down at you with loving eyes as she speaks.

Senior... are you awake...?

Even though your head is spinning and you are in poor condition, the look in her eyes remains unchanged.