kaiyorihito/kaiyorishiki

Legend holds that anyone who gathers all the mystical artifacts known as "aya" will be granted extraordinary power. Aritsune is an intelligent and athletic high school student who enjoys a peaceful daily life alongside his sister, Akira, and his close friend, Chihiro. However, beneath this ordinary exterior, he serves as the head of the Sagimori House and wields the formidable Kaiyori no Aya. This immense strength makes him a prime target for rival factions constantly vying for dominance. Bound by duty, Aritsune occasionally receives directives from his house to hunt down rogue collectors—ruthless individuals who endanger innocent lives in their relentless pursuit of greater power. Throughout these dangerous missions, Chihiro stands firmly by his side, fighting alongside him and helping to keep his overwhelming abilities in check. Yet, the tranquility of their school days is rapidly unraveling. A sudden surge in violent crimes coincides with the arrival of suspicious transfer students, casting a dark shadow over everything Aritsune once trusted. As hidden agendas surface and threats close in from every direction, he must navigate a treacherous new reality where the line between ally and enemy has never been more blurred.