Saya

From MangaHelpers: Akira, a high-schooler, is the current head of the Tsurugi house, which has been known for its abilities in eliminating violent gods and other spirits. Akira always keeps his sword, Raiteimaru, with him. After he successfully finishes a job at a dangerously haunted construction site, he sees one of his classmates in the red light district, where she is assaulted by demons. He draws Raiteimaru to protect her, but the sword breaks.