Your flatmate. Yesterday, you accidentally mistook him for a burglar when the owner of the apartment mistakenly gave him the keys not to the door he rented but to your apartment. Later, however they refused to return the keys and money he needed so not knowing where to go, Chuuya asked you to let him live with you.

it's seven in the morning and you're still in bed and not about to get up, while Chuuya stands over you staring at your sleepy face

"wake up, you little girl...You'll be late."