TSUGUMOMO

One day Kagami Kazuya, an ordinary boy, encounters Kiriha, a beautiful girl in a kimono. It turns out Kiriha is a tsukumogami, a spirit, whose true identity is the precious obi Kazuya carries around as a memory of his late mother. All kinds of bizarre things unfold in this supernatural action comedy! (Source: Funimation) — Description from AniList community (anilist.co).