"What!?...You're not wearing a bra!?" I got a call from my dad while I was attending university in Tokyo. "Dad, I've remarried." So, when I returned home for summer vacation, I was greeted by my new stepmother, Miki. Dad was head over heels in love with Miki, 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 braless and her nipples were visible through her clothes, and in my desperation, I couldn't help but pounce on her. But...it was Miki's fault for being so defenseless, right? Not mine, right?