Staying at his relatives' house during summer break, Takeshi was on edge. He had been looking forward to seeing his beloved aunt Mari, but one night, he accidentally witnessed her having sex with his uncle. Deeply shocked, Takeshi remained depressed afterward. However, when he found himself alone with Mari, he finally confessed, "I love you." Seeing her shocked and rejecting reaction only intensified his emotional turmoil. The next day, as Takeshi prepared to return home, Mari suddenly asked, "Was yesterday's confession for real?"—setting the stage for an unexpected turn of events.