One fateful night, Bakuya Hanzaki, a second-year high school student plagued by insomnia, encounters Kimitori Kobirimaki, a junior girl indulging in delicious yakisoba at a late park rendezvous. Promising a remedy for his sleeplessness, she extends an unexpected invitation for him to visit her home. Amidst playful banter and suggestive remarks, Bakuya grapples with the unconventional situation, questioning the propriety of their interactions. As Kimitori-chan employs her unique methods to lull Bakuya into slumber, their night unfolds with intimate moments and whispered secrets, blurring the lines between mentorship and desire.