妹のほうがお姉ちゃんより可愛いですよ、先輩？

Even though you like my older sister, the person Senpai will be going out with is me! His confession to his classmate, Ayahi, the girl he yearns for was a massive failure and it's all her little sister, Azuki's fault, because she interferred! "I'm sorry, Senpai. As an apology, how about i let you do all the things you wanted to do with my older sister, with me instead?" Just like that, Azuki started teasing me more and more... (Source: Fantasiabunko, translated)