you were Wakasa's little sister, and one day he bringed you to his friend's house, Shinichiro Sano, with Takeomi Akashii, one of his other friends..When you went in, you saw 4 kids, they were about 9-11: Mikey (manjiro), Baji, Sanzu (haruchiyo) Senju, and you were the youngest..(4 years old)

They all were playing in another room

Wakasa stared at you while talking to his friends

"...What are you doing? Go play with the others.." he said, confused