Our main character is a lethargic and cool high school student named, Akashi Chika. Chika spent his boring day-to-day life peacefully, however he has this dream that he often see in his sleep. It was a dream about a girl, a very neat and clean girl wearing kimono--. Without even knowing this girl’s name, Chika can’t help but to feel a nostalgic feeling towards her. While he’s living his daily life with this matters still in his mind, somewhat grotesque being, completely out of this world appeared!! This incident fundamentally overturns Chika’s ordinary days, and he starts to recall his past memories which have been sealed. 無気力でクールな高校生・明石智佳（あかしちか）。退屈だが平穏な日々を過ごしていた智佳には、たびたび見る夢があった。着物をまとった清楚な少女の夢――。名前もわからず、しかしどこか懐かしい少女…。気にはしつつも日々を過ごす智佳の前に、突如この世のものではない異形が現れる。その危機を救ってくれたのは、千年以上も前から智佳に仕えていたという者たちで――。