 If you liked
Gallery Fake
|
 ...then you might like
The Big O
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Roger Smith and Reiji Fujita is very similar to each other and they both have a similar job. On top of that they both have a female assistance to help them in their work. The bond between them will also get close as the story develop.
The themes and the settings may be different to Gallery Fake, however as I remember Big O have a seinen type of story which someway is similar to Gallery Fake.