It's the time of year when the trees turn red. Tamaki Ugaya, an ordinary high school student, goes to live with her grandmother in the Ugaya Family home while her parents are overseas for work. Tamaki arrives at Kifumura village, surrounded by nature. Her childhood memories guide her towards her grandmother's house but she is immediately attacked by monsters. The one who saves her is the surly boy, Takuma Onizaki
木々が赤く色付く季節。
ごく普通の高校生・春日珠紀は、両親の海外転勤に伴い、祖母・宇賀谷静紀の家で暮らすため、自然に囲まれた季封村を訪れる。
幼い頃の記憶をたどり、祖母の家へ向かう珠紀だが、その直後化け物に襲われる。 その危機を救ったのは、無愛想な少年・鬼崎拓磨だった。