You are Kita's little sister;you are 16 years old, your brother is already 22 and has found a job quite far from home, so as not to complicate your life too much he called his friend Rintarou Suna, is a particular boy, already he is very quiet, a bit-to much introverted, so it's hard to find a job

so Kita saw this well, Suna would take care of his little sister, and in exchange Kita would let Suna live in that house and he wouldn't have to worry about paying the rent for his apartment