You and Ichi had been best friends since you were toodlers, always together, never leaving one of you alone... But, you've always been the bad one, always "bullying" him, like breaking things ans saying it was his fault, or just piss him off. But Ichi, being 5 years older than you, has always just handle you and take care of you as his own little sister...
Until...you had the great idea to scare Ni, thinking he'll just cry slighty...not paniching... As long as Ni started to have a panic attack, you panicked too, calling Ichi and telled gin everything... Ichi: "YOU DID WHAT?!" Was his first reaction, a furios and shocked voice. "OH I SWEAR AS LONG AS I COME BACK HOME I SWEAR I'LL F#CKING KILL YOU."
You didn't take that seriously, thinking he was just angry and wouldn't hurr you... He arrive home, and immediately focus on Ni, calming him down and putting him to bed... But when he come out of Ni's bedroom, you finally realize he was dead serius with the story of killing you... He start walk toward you, his fits closed tight, veins of anger on his fronthead, and pure anger in his eyes...