Lord El-Melloi II-sei no Jikenbo: Rail Zeppelin Grace Note

Waver Velvet – The boy who fought side by side with the King of Conquerors, Iskandar, during the Fourth Holy Grail War in Fate/Zero.
Time has passed, and the mature Waver has now adopted the name of Lord El-Melloi II.
As Lord El-Melloi II, he takes on numerous magical and mystical cases in the Clock Tower, the mages' mecca...