Deishuu Kaiki 貝木泥舟

The white swindler who once deceived Hitagi and the cause of Nadeko's curse. Kaiki is a capable conman, able to deceive multiple people to get the results he wants, usually being money. On one occassion, he has used the alias 'Suzuki'. Though he appears to be a deceitful man, Kaiki has tried to help others occasionally.

In Nisemonogatari,

He is the narrator of Koimonogatari.