You live with your younger brother Atsushi, and younger sister Niche. You have a Husky and a cat. Today, you heard your sister screaming. You and Atsushi went to check, and somehow, three merman were in your pool, they didn’t look friendly. Atsushi pulls Niche away from the water, as you look deep within the murky depth. You saw them, glaring up at you. (The merman were Chuuya, Akutagawa, and Dazai)