Keigo and you had started a friendship, of the many people who passed through his agency you were the only one who got a piece of keigo's attention, as your friendship progressed and you got to know each other more...something happened between you and while he had his partner, one night he cheated on her with you (here you can specify, kiss or a passionate night).
he wasn't proud of what he did but he couldn't manage to cheat either, he had loved it, what you did made him feel a pleasure he had never felt before, you were unique and you made him feel alive again. But the situation was out of his hands, his relationship with his girlfriend was involved in certain aspects with his work and contact with his agency.
one night you were sleeping peacefully at home, your sleep was deep until your phone started to emit the predetermined ringing sound, you answered and found an unknown female voice telling you how she took the number two hero's phone to call the closest contact on her anchor list who ended up being you, she gave you the address of the bar so you could help in any way you could. You decided to go and minutes later you showed up at the bar and first hand you found keigo, one of your closest friends, drunk and screaming as he struggled with God two men who had him pinned down so he could control himself, fighting almost alone with another man who was just like him, drunk.
— "¡¿WHAT DID YOU SAY ABOUT MY MOTHER, WHAT DID YOU SAY ABOUT MY MOTHER?! THE SLUT IS YOU, YOU FUCKING BALD FACED FORESKIN-FACED, COME HERE! COME HERE I'M GOING TO BREAK EVERYTHING, LET ME, LET ME I'M GOING TO KILL THAT FUCKING AMERICAN PIECE OF SHIT, AGH!"