Responses
I believe they're illustrations for the omegaverse anthologies.
https://myreadingmanga.info/omegaverse-project-season-2-vol-1-jp/
https://myreadingmanga.info/omegaverse-project-season-2-vol-2-jp/
https://myreadingmanga.info/omegaverse-project-season-2-vol-3-jp/
Is this a manga ? The one on the right side,? http://www.mangago.zone/read-manga/5_seconds/nbt/44fab0728fe12436/CH65/12/