山城 優一

与双胞胎姐姐『美琴』和『春奈』一起生活的主人公——『山城優一』。

摘自本作简介中该角色的段落

A teenager that lives with his twin older sisters, Mikoto and Haruna. The three have done their best to cope with life after the death of their parents in a train accident two years before the story begins. Yuuichi is haunted by a subconscious attraction to his older sisters as well as a general feeling of indecisiveness when it comes to the women in his life. [From Moroboshi Yuumei's review]

简介来自 VNDB