SHIC-119 My little sister doesn't wear a bra at home, so as her older brother, I'm a little worried... Himari-chan Natsukawa Himari

Himari doesn't wear a bra when she's at home. Is it because she doesn't like the tightness, or is it to relax? Her brother, who has such a sister, has recently been worried about Himari's behavior. Even though they're family, frequently seeing his teenage sister's breasts is bad for both his heart and his groin. However, the more he thinks about it, the more wrong thoughts cross his mind...