Eiken

Chiharu Shinonome

東雲千春

Chiharu is a cute teenage girl with large breasts, red eyes, and long red hair that has 1 strand of hair sticking up (known as ahoge (アホゲ, "idiot hair")). She wears the typical Zashono Academy uniform, which consists of a white undershirt, green sweater, yellow vest, purple skirt, black thigh-high socks, and yellow shoes.

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Densuke Mifune

三船伝助

Densuke Mifune (三船 伝助, Mifune Densuke) is a shy 15 year old boy. Before he joined the Eiken club, he was shy and did not have many friends except for Shimada and Todoroki.

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Kirika Misono

御園霧香

Kirika Misono (御園 霧香) is a student at Zashono Academy and the unofficial leader of the Eiken club. She is actually in love with Densuke Mifune, but accepts his affection towards Chiharu Shinonome. Nobody knows much about her but knows that she uses Densuke Mifune. Notable are her M-cup breasts.

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Komoe Harumachi

春町小萌

Komoe is an 11-year-old girl with long, pink hair worn in huge, arching pigtails. Despite her youthful age, her most noticeable features are her L cup breasts. She wears the Zashono Academy uniform, which is composed of a white undershirt, a pink vest, a purple skirt, and black thigh-high stockings with yellow shoes. Komoe is also seen wearing a pink maid apron over her vest, usually when she is in the Eiken Club.

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Yuriko Shinonome

東雲百合子

She is almost the exact opposite to her sister for 2 reasons. Unlike most of her family, her breasts are not very developed, only reaching a B-cup. In contrast to her mother and sister's F-cups which continue to get bigger throughout the series. This is something she is very jealous of.

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Lin Grace

グレース鈴

Lin Grace (グレース• 鈴) is a British member of the club and is followed around by Kuma. She met Densuke when he was in one of the club buildings looking for Chiharu to return her wallet. She is the daughter of a CEO to a major company and is its heiress. She is, in fact, so wealthy that she has an old European style castle as her room and must fly to and from school everyday on a personal jet.

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Sensei

先生

Keiko Shinonome

東雲京子

Keiko is a single mother; although later she admits to Densuke Mifune that she has feelings for him despite being significantly older than him. She intially attempts to seduce Densuke, but stops after realizing that her daughter is truly in love with him.

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Miharu Shinonome

東雲美八留

Miharu Shinonome (東雲美春 Shinonome Miharu) is Chiharu Shinonome's cousin. Like Yuriko Shinonome, Miharu does not possess the large breasts of Keiko Shinonome or Chiharu, but Miharu's breasts are still larger than Yuriko.

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Kuma

くまちゃん

Kuma is actually a small shy pink haired girl who wears a bear suit. She has only been seen outside of this suit by Densuke. In the bear suit she gains super strengh much to the annoyance of Densuke who is usually on its receiving end.

Bio from Fandom, licensed CC BY-SA