 If you liked
Gankutsuou
|
 ...then you might like
Kindaichi Shounen no Jikenbo Returns 2nd Season
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Both give different feel, both leaves different impression, but the structure of both are based on the French novel The Count of Monte Cristo. Both are mysteries.
In both a person will be isolated from the rest of the world with lots of gold for many years (not even a minute of sunlight). Followed by revenge, then MC changing that person.
Kindaichi focuses on trick, guessing, thinking. Gankutsuou more on human relations.
**In Kindaichi only the first four episodes are common with Gankutsuou.