Itadakima~su! (a.k.a. I Humbly Receive) by Yamatogawa
Eiko Nanami works as a maid in the Ijiyuuin mansion, but that's only a cover for her true identity as A-ko, the phantom thief. One night she breaks into her wealthy employer's house, but it seems the 'treasure' she wants to steal might be Mr Ijiyuuin himself.
