After a stupid incident, straight A-student Tagaki Shiho turns into an unsociable hikikomori. Fearing for her daughter's (social) life, her mother forcibly enrolls her in a fancy school in Tokyo. Despite being homebound for 5 years, the mousy and unfashionable Shiho makes a startling discovery.

Shiho: Why does everyone act like they're stuck inside a gaudy shoujo manga??

And nobody else seems to notice, either...?!