Yamada, a ronin student, had grown accustomed to seeing Hotaru, his beautiful big-breasted neighbor and married woman, almost daily at the convenience store or on their way home. One day, Yamada accidentally caught a glimpse of Hotaru changing clothes through a gap in the window of her house. Her appearance was so stunning it felt like a dream, deeply stirring Yamada's emotions. What surprised him even more was that she was not wearing a bra. From that day on, Yamada noticed she often went braless on weekends, sending his heart racing. Then one day, Hotaru came over to Yamada's place, braless as usual, offering to share some food. The timid Yamada was flustered beyond words, but his friend Odagiri, who happened to be in the room, boldly embraced the defenseless Hotaru, heating up the atmosphere. In that instant, Yamada's heart was shaken to its core.