Morio Yuka

Nanako's younger sister.

She came to Tokyo to attend a preparatory school, but was puzzled because she did not know that Issei would be attending the same school with her.

She is serious and firm, even a little too fastidious. She is the type of person who says what she wants to say firmly and is constantly arguing with Issei, but in fact, she is a naive girl who always pays attention to those around her.

She is concerned about Nanako, who has just lost her husband, but she is also worried about Issei. She is the first to notice Nanako's feelings for Issei and has mixed feelings for him.

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