Kikuchi Yuuko♀

A female classmate who is in the same second grade as the main character and is also good friends with Manami. She is generally cheerful and sociable, but she has a stronger aversion to vulgar jokes than others. In class, she is often seen chatting with Manami and Rumi, another good friend of hers.

She has a good relationship with the main character through their mutual friend Manami. However, since they opposite sex, they only exchange light greetings and chit-chat.

As mentioned above, she hates to talk about anything below the waist, and her excessive reactions are to the extent that he even feels a sense of fastidiousness.

Although she is reluctant to admit it, her sexuality is actually quite good, and her sensitivity in particular takes our protagonist's breath away. Her fastidious nature may be the result of her excessive sensitivity that she does not want to admit.

As a side note, she has inverted nipples, and the sensitivity of her nipples is particularly high.

[From official site]