Tanaka Mizuna

Tanaka Mizuna (田中みずな Tanaka Mizuna) is the eldest of Tanaka's younger twin sisters and a reoccurring minor character. She is classmates with Yamashita.

Appearance
Mizuna has short black hair, with a Tanaka tuft on her head. She has black eyes, like her brother. She is shorter than her sister Yomogi, but is about the same height as the other girls.

Mizuna wears the blue first year uniform with knee-high socks. In Chapters 53 and 66, she is shown to favor shirts with letters or numbers on them. She has been seen with the characters "3" ,"R", "1", and "P" on her shirt.

After school, she is sometimes wearing a similar jacket to Kitanaga, implying she's in the Swimming Club.

Personality
Mizuna is more angry than her sister, Yomogi. She yells at Tanaka when he is too harsh, or weird.

Mizuna's gag is that she will open the door to the Science Room to see her brother in a compromising situation with Ueno. This lead her to start investigating the Science Club.

Her favorite food is wagashi filling.

Translated
Mizuna is introduced in Chapter 30, where she tastes the Peroririon.

She has had a few other minor appearances translated thus far:
 * Chapter 33: She opens the club door to get Tanaka's thermos while Ueno is wearing the Sqool Swimsuit and sees Tanaka in a compromising position when Ueno is dragged out of the room by the sudden shift in quantum waves.
 * Chapter 35: She tells Tanaka that she doesn't have much hair on her legs.
 * Chapter 42: She investigates the Science Club with Yomogi. She sees Tanaka holding Ueno's Mochi Bra.
 * Chapter 53: She is brought in to investigate the Reflecushion. It smells like the cushion she uses at home, which creeps her out.

Untranslated
Mizuna is put on trial for not wearing underwear in Chapter 74.

Trivia

 * So far, she is the only reoccurring character who's club has not been explicitly stated. She wears the same gear as Kitanaga after school, and an untranslated chapter (74) seems to imply Kitanaga is the president of her club, so we have marked her as a Swimming Club member.