Kokona Tagawa

Kokona Tagawa (田川 ここな Tagawa Kokona) is a student from class 3-B and Meg Kataoka's former classmate who essentially blackmails Meg to help her study after Kokona nearly drowned from failing to learn how to swim.

Appearance
Kokona has wavy dark-colored hair that is tied in pigtails by pearl hair ties, dark-colored eyes with long lashes and a round face.

Personality
Kokona is a self-centered and selfish girl due to her neglecting Meg Kataoka's need to study for her own grades and making her feel guilty for Kokona's incident. She thought that after just a bit of swimming practice she would be good enough to swim in the sea. The title of her own pick-up box is "Doesn't the world exist solely for me?!", hinting at her egoism. She loves the spotlight.

Plot
Kokona and Meg Kataoka meet after Meg was practicing swimming so that she could help Kokona study for the upcoming exams. Nagisa Shiota, Kaede Kayano and Korosensei shortly after find out that Kokona is blackmailing her. They question Meg and she reveals that she has taught Kokona how to swim, but she still has been too inexperienced to swim in the sea, so she almost drowned in the sea after trying to impress her crush. Afterwards Kokona used the incident as blackmail material.

To stop that, the four of them organize a plan to help Kokona overcome her fear of water. In her sleep, they bring her to the lake at the mountain and disguise themselves. They trick Kokona into thinking that she is dreaming while helping her trying to swim against the flow.

The next day, Kokona has swimming class and gets told that she improved drastically. Meg notices that and says how it seems like Kokona doesn't need her help anymore.

Meg Kataoka
Meg and Kokona used to be friends because they were in the same class in middle school. Meg taught her how to swim, and even though Meg wanted her to practice more, Kokona went swimming in the sea which resulted in her almost drowning. Afterwards she guilt-tripped Meg into helping her study at all times. They stopped studying together after Meg saw that Kokona improved her swimming.

Etymology

 * The name Kokona means "here" (ここな) in Hiragana.
 * However, when written in kanji (琴々奈, 琴々南 or 湖々菜), it could possibly mean:
 * 琴々奈 - "Japanese harp" (琴) (ko) and "apple tree" (奈) (na).
 * 琴々南 - "Japanese harp" (琴) (ko) and "south" (南) (na).
 * 湖々菜 - "lake" (湖) (ko) and "vegetables, greens" (菜) (na).
 * Kokona's surname Tagawa means "field, rice paddy" (田) (ta) and "river, stream" (川) (kawa/gawa).

Trivia

 * Kokona was omitted in the anime.
 * Kokona had a traumatic fear of water, swimming and the sea.
 * After overcoming her fear, she came to love swimming and swims three times a week.
 * Kokona's last appearance is in Chapter 118, visiting the restaurant of Class E together with Kaho Tsuchiya.