Keiichi Maebara enjoys life in Hinamizawa and has fun playing games with his friends at school. During a chance encounter he meets Shion Sonozaki, the supposed twin sister of Mion Sonozaki. Keiichi and Shion develop a friendship, and during the Watanagashi Festival they sneak into the ritual storehouse and learn about Hinamizawa's horrible past, soon setting off a chain of events and earning the wrath of Oyashiro-sama's curse.
