お兄ちゃん

The protagonist of the game and the big brother of Yuka. He is secretly in love with his little sister for quite a long time. They were still extremely close until a while ago but Yuka has been getting more and more distant for some time. Yet, the protagonist doesn't give up and tries to maintain their bonds by trying to talk more often with her or trying to spend more time with her. However, the result of his efforts are not up to his expectations and the distance between them is growing without him knowing the reason.

One day, he hears Yuka talking on the phone in the living room with a very sweet and cheerful voice. The protagonist first thinks that Yuka is talking with her friend Youko but when he hears his sister pronounced the name of a certain "Takashi-kun", his heart stops beating; the boy she's talking to is... her boyfriend?

Not wanting someone to take the one who is the most dear to him, he decides to take advantage of the month of absence of their parents (because of their work) to flood Yuka with his sincere love.

Will his feelings reach her?