Sono Maid Kiken ni Tsuki

Melissa has inherited a billion yen ring from her grandmother. Melissa hires a bodyguard to protect her, but it turns out to be a “male maid”! Arthur, with his strong body and maid's uniform, gracefully performs his maid duties while knocking down ring-hunters one by one. Melissa is puzzled by his eccentricity, but as she spends time with him, her heart slowly begins to unravel.

The days begin to get a little too exciting with a dangerous maid under one roof.

Note: It was previously a One-Shot that received a lot of popularity and then became a series.