亚季

【我】和杏的妹妹。被【我】称作【自大的那个】。 活泼开朗、好动喧闹、神经大条、粗鲁任性。 精力充沛，在学校里加入了许多社团，身体一停下来就会不自在。 常有奇思妙想，喜爱尝试各种可能。不累艰难，不怕失败。努力家。 对【我】毫不客气，一有机会就讽刺、挖苦、羞辱、践踏哥哥的自尊。 其实是个心口不一、腼腆羞涩、不擅长处理自己事的自大的胆小鬼。 和杏同样与【我】从小一起长大，既喜欢杏，也喜欢【我】。 自幼受到【我】的影响:，已是标准OTA，为成为GAL声优拼命努力着。

简介来自 Bangumi

Aki is the younger of Boku's twin sisters. Boku refers to her as the "cheeky", selfish imouto. Aki was originally in love with Boku's now-deceased older brother (referred to as Ichi-niichan), whom she viewed as a very responsible and incredible person. Thus, she in part wants Boku to be like him, but decides to make fun of him for being an otaku and a ronin. She's not as merciful as An is, which often puts her and Boku at odds with each other. They do get along through their common interested in anime, as she herself is a fan (and a cosplayer). Unlike the rest of the cast, Aki is very detached from the events of the game, basically doing her own thing while studying to be a voice actress. Just like An, she moves in with Boku to make sure things are alright with our protagonist, but also because there's a nearby acting school that she wants to attend. A point of interest is that due to Aki's low level of interaction with the other characters, it is through her work that the protagonist develops feelings for her. Her talent as a voice actress shines in the story, since she is contracted to be a VA for "Ai kawarazu na boku". Much to Aki's chagrin, Boku prefers to see her act as the innocent and cute imouto (which is nowhere near what her real personality is).

简介来自 VNDB

はっはっはー。バカいっちゃいけない。 妹なんてロクなもんじゃない。亜希は、僕の「ナマイキな方」の妹だ。いつも僕を馬鹿にして、説教して、引っ張りまわすワガママなヤツ。

简介来自 Getchu