榊由美子

从主人公他们就读的私立美浜学园设立当初就一直在学的女孩子。
父亲是在关东圈有着强大影响力的集团企业的总帅，也就是俗称的千金小姐。

黑长直，五官端正，言行举止让人感到很有教养，然而有点怠慢与他人的交往，在没有必要的情况下常常一个人单独行动。

因此平时就洋溢着一副生人勿近的气氛，不过也有着喜好草根饮食与兴趣这般让人意外的一面。
A second-year student at Mihama Academy, the daughter of "East Beach Railway Express Group" tycoon. After Mihama Academy had been established, she was the first student to enroll. Her characteristic is her waist-length black hair. Because of her bluntness and hard-to-please personality, her association with strangers is bad. Always trying to be alone, she hardly comes along with the others. She always carries a box cutter with her and uses it to threaten others when she gets angry. Yumiko has read so many books that she’s called a “Bookworm”, and especially mystery novels are her favorite ones. Although she’s such a lady, she changes completely in meal time, junk foods like a cup of fried soba noodles is one her of favourite dishes.
Her representative fruit is grape.

Shiori-chan's review