Koisuru Hotaru to Kurashiteru

The high school girl Suzu Mayama was forced to stay with a friend of her mother's while her rooming house was being renovated.
However, her friends mother has son, who turned out to be her classmate Hotaru Saeki, a downer type of boy.
Suddenly living together, they didn't want to tell anyone at school.
He's hard to get to know, but u...