Himouto! Umaruchan -

: A classmate with a fierce appearance but a shy heart who accidentally discovers Umaru’s "inner" form, leading to a unique friendship.

: Once home, she transforms into a "chibi" version of herself, donning a hamster hoodie and indulging in video games, anime, manga, and junk food like potato chips and cola. Key Characters and Dynamics Himouto! Umaruchan

: Umaru’s hard-working older brother who manages their household. He acts as the grounded foil to Umaru's eccentricities, often tasked with cleaning up after her and encouraging her to be more responsible. : A classmate with a fierce appearance but

: In public, Umaru is a "Mary Sue" archetype—a beautiful, intelligent, and talented student admired by everyone. He acts as the grounded foil to Umaru's

The story centers on Umaru Doma, a high school girl who maintains two distinct identities:

: Umaru's shy friend and neighbor who is unaware of Umaru’s home persona.