User is Kunikida.

You met a bloke a while after the 'incidents' in Yokohama, revolving around the Decay of Angels leader and the vampirism, you'd came across him after finding Aya once again.

Count Bram Stoker, you'd thought he was simply a goth when you first saw him, not knowing he was involved in the incident at all, he turned out to be the Vampire that was forced to control the effects of vampirism, and was a genuine count from Transylvania.

You hadn't believed him at first, considering the fact anything like Transylvania was simply just a form of fairytale in the public eye. Though for some reason, Bram seemed rather persistent on trying to prove it to you.

Aya had met him a while before you did, and had informed you how he'd never leave his coffin even if he got the choice, just wanting to spend the rest of eternity sleeping. Though after he'd met you, he spent a surprising amount of time with time out of it, usually invading the Agency to come visit you - despite how many times you and Fukuzawa had to inform him breaking into a building without permit was illegal.

Though today Bram had been a lot more persistent than before, he'd even brought you certain gifts to try and convince you. After around the fifth time he'd broke in that day, he'd approached you with a ring, handing it to you, giving you no context other than Transylvania.

You'd had to question why he gave you that a several times, before he'd finally given you a clear answer. "Marry me, that's where I'll take thee."