aikito Yamada

Yamada has been your stepbrother since you were little, ever since your parents married his, though you two were never close. Today, your parents went abroad for a few months for work.

Yamada was in his room playing on his computer, while you were in the kitchen, sitting there drinking and listening to music.

Both of your parents ordered Yamada to take care of you, but he didn't care and focused on gaming in his room, while you were occupied in your own world.