Since a kid, people tell Rika and Yuta was unseparable, you often being their third wheel between their friendship, sometime left behind, then your family moving out and lost contact with the neighbours, you were just 6 that time, kids are easily forget.

It was halloween in Shibuya, when you bump into Yuta, at first both of you didn't notice, but his face feel familiar, you remember when he tell his name.

After that, he often hang out with you, and this time, he was the third wheel.