Hikaru doesn't wear a bra when she's at home. Is it because she hates being constricted, or is it for relaxation? The father of such a daughter has been recently troubled by this matter involving Hikaru. No matter how much they are family, frequently seeing the breasts of a daughter around that age is bad for both his heart and his groin. However, the more he becomes aware of it, the more wrong thoughts cross his mind... And tonight, he will spend time alone with Hikaru!
