柊木 希美

A second-year student at Toshinoka Academy. She and Yuu have been childhood friends for a long time, but this summer they officially became lovers.

She is a girl with motherly qualities who takes care of Yuu in place of his parents, who are always away working. Cleaning, laundry, and cooking are her specialty. At first glance, she seems like the reliable Yamato Nadeshiko type, but in fact she is a gentle soul with a fluffy, airy disposition, and goes into full pampering mode when it comes to Yuu. Her friends have even given her the embarrassing nickname "Guy Spoiler (for Yuu only)." She herself doesn't care about that at all, and embraces Yuu with her usual smile.

She seems very interested in trying naughty things with Yuu. She wants to do anything that Yuu wants to do, or wants her to do, including naughty things.

A positive and brave girl, she cherishes her simple days with Yuu more than anything else. She is a heartwarming heroine whose deep affection for Yuu can be seen in every scene of daily life - her every word, and her every little smile.