In the realm of Japanese folklore, tsukumogami are inanimate objects infused with spirits, divided into the refined 'tsugumomo' and the chaotic 'amasogi.' Kazuya Kagami cherishes his late mother's obi, a bond that saves him from a deadly amasogi assault one day. Surprisingly, the obi transforms into Kiriha, a stunning girl and a tsugumomo tied to Kazuya's family. With Kiriha's emergence, Kazuya delves into a fantastical existence teeming with deities and sentient objects, unearthing a world he never knew existed.