Question: are mika and yuu canon?
Answer: 5 Reasons Why Mika and Yuu Are Canon [Owari no Seraph] Mika became a vampire after being separated from Yuu, while Yuu believes he has been killed by a vampire. Both of them will start a new life after the separation, and while Yuu will seek revenge towards vampires, Mika will search a way to reunite with him.