Mizuha

Mizuha is one of the main characters of the "new era" arc.

Appearance
Mizuha is a girl with a slender build and long, black hair. Most of the time, she wears a black hair tie with a feather attached to it. She says it's her favorite.

Background
Mizuha comes from a rather well-off family which is indicated by the size of the apartment in which she lives with her parents. Her mother is a writer and is very demanding, always pushing her daughter to be the best at something but at the same time forgetting about her successes. This also means that she has close to no free time at all. Due to all this pressure, Mizuha started becoming depressed.

The only person that sees Mizuha as a friend (and the other way around) is a girl called Hanna. The rest of the girls are jealous of Mizuha because a lot of third years (and generally attractive guys) fall for her. Mizuha has always rejected them but nevertheless, she is accused of "stealing" them from others.

Plot
Mizuha is first introduced on the last page of chapter 116, where someone is running towards her shouting her name and when she finally turns around, the person gives her back her favorite hair tie.

In the next chapter, it's revealed that this person was Aoki, a junior to Mizuha. While Aoki and the rest of the Occult club are in their club room and thinking about what a "peaceful world" would be like, Mizuha joins them, explaining that she left the Naginata club. Shortly after she leaves and walks down the hallway, coming across two students looking in awe at the trophies she won and a group of girls gossiping about a third year. After she arrives at home, she only has a short moment to relax before her mother comes in and tells her about a girl from another floor of the apartment building entering into an important ballet tournament. She offers Mizuha to try ballet as well, oblivious to the fact that she had already won the tournament when she was ten. After Mizuha tells her about this, her mother takes a picture with her. However, as soon as Mizuha mentions that she wants to take a break, her mother becomes quiet. Quickly, Mizuha backtracks and adds that it'd be only for a day. After her mother leaves, she goes outside onto the balcony of the apartment and thinks that she wants to die.

Relationships
Fushi

While Mizuha doesn't "actively" know or remember Fushi, she reacts to Aoki saying his name by gripping her left arm. All of Hayase's successors carried a knocker in their left arm, which indicates that she might be distantly related to Hayase's clan. When Hanna asks if she knows him, she answers "No, not really... it just made me feel really nostalgic."

Hanna

Hanna is Mizuha's only female friend. They seem like close friends, but Hanna is still rather awkward around her and doesn't think they're especially close.

Aoki

Aoki has an obvious crush on Mizuha and even says so openly at some point, saying "A peaceful world is where your crush is in the club room" while Mizuha is there. It's unknown if she reciprocates these feelings, however she says that she already has a crush on somebody who is in the same club as her. Since she spends a lot of time with the people from the occult club, it's possible that she likes Aoki.

Skills
Talented

Mizuha has had many "hobbies" in her life, from playing the piano to dancing ballet and being in the naginata club. The naginata is a traditional Japanese blade, and being in a club with the same name probably means that she can handle the weapon. On top of that, she has only ever quit these hobbies or clubs after winning an important tournament.

Stronger than she seems

While Mizuha is a slim and feminine girl, she also seems to possess a certain amount of strength. For example, she can be seen carrying a tower of books with no visible issues concerning weight and balance. Another time she's carrying several bags to a trash container. She throws the bags up high, around two times her own height, and thus they land atop the other bags in the container. Again, she does this without any visible trouble.