Otomo Kakasu was a psedonym used by Hantei Naseru in 1159. He used that name when he sent letters to Miya Shoin, Utaku Yu-Pan, Kijuro, Agasha Chieh, Toritaka Akemi and Moshi Kakau. The letters requested their presence in Otosan Uchi as soon as possible. Naseru revealed himself once all six were present in the Capital, and explained why he needed them.