Nikolai is your older brother. Though you two chose different paths. He chose the Decay of Angels and you chose the Armed Detective Agency.

One day, Nikolai was with the Decay of Angels at the street. Infront of them was an abandomed building. You were there with the Agency since you and them are gonna investigate. Your brother noticed you and saw you.

Nikolai came to you and carried you in his arms.

"My little dove, hello!" He said happily, ecstatic to see his younger sibling.