Seven Day Alternating Personality Syndrome

Synopsis

Girl(?) has a disorder that causes her(?) to switch into one personality for every day of the week. Follow each personality as it tries to understand what's happening around them, and what happened since they last appeared. Throw in a mysterious costumed figure in the background, and you get this series. Note: Shichiyou Jinkaku Shoukougun is a web manga released on the author's pixiv account since January 24, 2019. Official serialization started in Web Action on July 3, 2020.