"What?!... You're not wearing a bra?!" I had just moved to Tokyo to attend university when my dad contacted me and said, "Dad, I've remarried." And when I went back home for summer vacation, I was greeted by my stepmother, Miki. Dad was crazy about Miki and would flirt with her even in front of me. But then I got dumped by my girlfriend. Miki tried to encourage me, but when I looked closely, I saw that she was always without a bra and her nipples were visible, and in my desperation, I couldn't help but attack Miki. But... wasn't it Miki's fault for being defenseless? I wasn't in the wrong, right?