Hatsukoi Killer Kouryaku Keikaku

A fifth grader named Sumi, experiencing puberty, unexpectedly stays at the home of their first crush, Kii. Hoping to appear mature and impressive, Sumi's attempts go awry. Amid the chaos, they are often caught or assisted by Kii, who is described as overpowering. The story blends elements of love and domestic humor as events unfold. Additional content includes 19 extra chapters.