Kowaku no Kowai no

Ageha has always been a timid girl, but ever since she met Kagari—a strange student whom no one else seems to see—things have started to get worse. While her classmates treat her like she’s disturbed for talking to herself, Kagari stays by her side, protecting her and telling her over and over again how much she loves her. However, what Kagari understands as “love” is far from human, and little by little, Ageha begins to lose the ability to distinguish between the people and the strange creatures surrounding her.

(Source: MangaDex)