ケモミミ☆トレーニング ～狂暴けもみみ令嬢調教トライアル

The protagonist is working at the Reapers Club.
Or, at least he was, until he broke a precious vase, and milady Shiine fired his ass.
Crippled with debt, his only choice to pay everything back is to become a "Trainer".
His first job is to straighten up a famously aggressive kemomimi girl...

[From DLsite English]