山城 美琴

主人公的姐姐，春奈的双胞胎姐姐。 性格非常会照顾人且可靠，代替已经过世的父母， 以家务为中心照顾着春奈和优一。 家务是她的拿手好戏。 是个努力家，对任何事都全力以赴。 不过似乎和机械的相性极差，是个严重的机械白痴。 非常重视身为弟弟的优一， 有时严厉，有时温柔，作为姐姐总是照顾着他。 平时总是面带笑容，性格温和，但有时也会做出出人意料的大胆举动。 而且一旦惹火她会很麻烦，她会笑眯眯地散发怒气， 经常让优一和春奈吓得发抖。 另外，虽然不太表露出来，但她其实是个不输给妹妹春奈的爱吃醋的人。 从美空学园毕业后，没有升入大学而是专心于家务。 为了哪怕稍微减轻一点家庭负担，曾有一段时间主要在白天做兼职， 但因为搞坏了身体，从那以后就专心于家务，守护着从父母那里继承来的家。 春奈和优一很关心没有上大学、代替母亲照顾家务的美琴， 但她本人似乎完全不在意，每天都笑容满面地度过。

摘自本作简介中该角色的段落

Mikoto is the elder of Yuuichi's two older sisters. She initially comes off as a very gentle girl that has taken it upon herself to look after the house as well as Yuuichi and Haruna. Because of this, she is responsible for the cooking and cleaning, giving her two younger siblings the time they need to focus on school and work. Incidentally, she has foregone the chance to go to college. Mikoto has come to occasionally rely on Yuuichi to help her with some of the household chores, particularly ones that involve machinery (something she admittedly is not very good with). Still, she seems to enjoy being the homemaker, and is known for her great cooking. While she is kind to everyone that crosses paths with her, Mikoto is generally nicer to Yuuichi than most, and often hints that she may look at him as something more than just her little brother. Out of the two sisters, she is the more forward one in terms of making advances on our protagonist. Along with her nice side, Mikoto is the deadlier of the Yamashiro sisters, as she has a tendency to punish Yuuichi in much harsher ways than anyone else. Much like Yuuichi puts his sisters above everything else, Mikoto puts Yuuichi's happiness above everything else. Still, she is driven by her attraction to the protagonist and her intense desire to always look after him. [From Moroboshi Yuumei's review]

简介来自 VNDB

主人公の姉で、春奈の双子の姉。 とても面倒見が良いしっかりとした性格で、事故で亡くなった両親に代わって家事を中心に春奈と主人公の面倒を見ている。 家事は得意中の得意。努力家で、何事にも一生懸命。 ただし機械との相性は最悪らしく、かなりの機械オンチ。 いつも笑顔を絶やさない穏和な人柄だが、時々、思いも寄らぬ大胆な行動を取ることも多い。さらに怒らせるとやっかいな性格らしい。 「あら、おはよう、優くん。うふふ、大きなあくび……もしかして寝不足？」

简介来自 Bangumi