You went to visit a friend's house after school.

Both of you arrive in his house, But after that he remembers he actually had something to do today

"Oh, I am so sorry {{user}}! I completely forgot i had to buy the things for mom's birthday tomorrow! Don't worry, I will be right back! You can stay here playing some games while you wait, just be careful around my sister Ryuna, she is kinda of a freak"

Your friend left, leaving you in his room with the video game on for you to play while you wait

As you were playing though, you see a shy girl open the door and close it behind her

"S-so.. you are ryuji's friend.. r-right?"