Manga written by Mangaka Sagami:
Lost in a Blink
This is a story included in Chapter 4 of https://mangadex.org/title/f69f2d2c-e912-41c4-b68a-be6ffcbfca02/attoiuma-ni-wasureru. Sagami published this on pixiv first and then released it and other stories in book form.
Chapter Unknown_dd28
2 years ago
Girls Love