SHIC-119 — My Sister Doesn't Wear A Bra At Home, So As Her Brother, I'm A Little Worried... Himari-Chan Himari Natsukawa

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