Kaoru's mother. She loves her son but still angers him from time to time. She will often enter his room without knocking, prompting him to yell at her. She will also clean up his room sometimes and tells him off for buying all that “junk” in the mail. It looks like she is a widow. Although she is not a busy as Nana's mother, she is often away at work.

Kaoru is a 17-year-old virgin who has an S&amp;M fetish. He has always dreamt about an SM relationship with his childhood friend Nana, who is looked upon as perfect and is always the target of boys' eyes. Their relationship has somewhat deteriorated through the years, due to them hanging out with different people and because Kaoru is not taking his education too seriously. 
One day though, Kaoru's mother gives some of his S&amp;M toys to Nana for safekeeping - Nana finds the leather one-piece that Kaoru bought and tries it on but accidentally locks herself in it and doesn't have the key! 
Kaoru frees her of the one-piece, but then Nana realizes she may like Kaoru's hobby more than she thought and subsequently the two of them start engaging in so-called "breathers". These breathers are intended to relieve Nana of stress, stress originating from her attempts at keeping her grades and her name perfect.

__Hobbies:__ ceramics, watercolor painting 
__Skills & Abilities:__  Type One elementary school teacher, Type Two junior high school teacher 

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__Non-Anime Roles:__ 
- Aurelia Dichala Dolce in "Soul Calibur III" (VG) (Japanese) 
- Miss Piggy in "The Muppet Movie" (live action movie) (Japanese) 
- Speed Buster in "No More Heroes Paradise" (VG) 
- Woman voice in "Soul Calibur III" (VG) (Japanese) 

Kaoru is in love with his childhood friend turned idol, Nana. Over the years, their relationship has become strained with the differences in their lifestyles, but Kaoru still fantasizes about Nana helping him realize his ultimate fantasy... a BDSM relationship with her! One day, Kaoru's mother finds his toys and gives them to the ever responsible Nana to rid her son of his fetish, but Nana finds a leather piece and accidentally locks herself inside! This moment awakens something inside of Nana, whose stressful life could use some fun and could be the start of Kaoru's ultimate fantasy...
 
(Source: Denpa)

Waka Sugimura