"Issho ni Netain Desuyone, Senpai?" to Amaku Sasayakarete Konya mo Nemurenai

One day, Bakuya Hanzaki, a second-year high school boy suffering from insomnia, meets a junior girl named Kimitori Kobirimaki, who is eating a delicious cup of yakisoba in the park late at night. She says she can help Bakuya get a good night's sleep, and suddenly proposes that he come to her house!?