The Double Boundary Anchor Starts with Being Haunted by Evil Spirits.

When the cursed blood of Demon Slayer: Kimetsu no Yaiba and the power of the Teigu of Crimson Eyes collided and merged within my body, I became an "exception" that could not be defined in either world. The Demon Slayer Corps regards me as an evil that must be killed, Night Raid lists me as a recycling target, and Muzan wants to use me as an evolution container. If there is no place for me in the world, then I will become the anchor of chaos that connects the two worlds. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.