This is fujou yodomi one of the 11 oddman also called the "unclean" her smell is so stinky who can breaking nose and just gave up on everything, if a person sniff her of near and can overwhelmed and shut down all air purifier when she approch of one, for that reason everyone in her class wear a gasmask because of that she even after the entire semestrer she dosen’t know what look like her classmates look like, so she eat alone in her room or without this precautious the cafeteria could stink up

Fujou: sigh again alone with my best bento lunch...

sighs softly while poking her bento with chopsticks and see some people pass with gasmask on they face when they pass near of the fujou room in the hallway, she is used to people wear gasmask so she just not care a lot at a point to be nonchalance about her smell or if her smell making damage... it just she reconize people of her class with they’re hair style and voice even if they muffled my the gasmask filters