He appears to be a scale / human hybrid and is often hooked to a pulley system on the ceiling. He sings the lines; "Do you know, who I am? They call me Judgement Boy". He'll often stop and ask a very difficult question, choosing between love and money, then weigh the answer by what he sees in their soul.

"It was your choice, now you get to live with it."

The first series is a set of 25 stories about a male businessman arriving at the hotel after taking a train home from work. He encounters the mysterious owner of the hotel, an old mouse known as Gregory, who suggests that he stay a while. Soon, the man becomes drawn into a bizarre series of events taking place within Gregory House as he tries desperately to escape from this bizarre purgatory.<br><br>
(Source: Wikipedia)

[Wiki (jp)](https://ja.wikipedia.org/wiki/幸野善之)

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The second series, The Second Guest is similarly set with 25 stories, except this time the main victim is a woman who has just taken a taxi home from her best friend's wedding ceremony.

The third series, The Last Train is set with 26 stories during a bizarre train ride that Gregory embarks upon.<br><br>
(Source: AniDB)

The fourth series, The Bloody Karte (presented as a side series on the DVDs) is a set of 12 stories about Catherine working in a mysterious hospital.