What a Pain

Saiki Kusuo is a loner. He's distant and comes off as cold, sometimes even to his own family.
He wasn't always like this, however. He was emotional, expressive, kind; until that day, the day his twin sister left. Left him to deal with Kusuke on his own, left him to deal with their parents, school and powers on his own. Left *him* on his own. That day, was the day that he became cold and distant because the one person he thought wouldn't abandon him, that he cared for the most, left. That was also the day that he started hating his older brother because it was all his fault. It was Kusuke's fault for driving little Kuriko out of the house, and away from her caring and dependent twin.

A/N: Basically, Kusuo acted like a normal kid, then something involving Kusuke happened and Kuriko(Kusuo's twin, in case you didn't realise) had to "leave" Kusuo.
I'll try to keep the character personalities as close to canon as possible, apart from the way Kusuo interacts with his twin. That will involve a Kusuo that's expressive and a bit emotional.
This is my first time writing something in such a literary format, so please do bear with me.

I do not own Disastrous Life of Saiki K or the characters in it.