If you're looking for anime similar to Layton's Mystery Journey: Katrielle and the Millionaires' Conspiracy, you might like these titles.
Adapted from the popular video game franchise, Ace Attorney follows rookie lawyer Naruhodou Ryuuichi (Phoenix Wright) and his assistant Mayoi (Maya) as he defends his clients in a court of law. With limited evidence and logic as his only weapon, can Naruhodou turn the case around when all the odds are stacked against him?
Both of these anime are very accurate adaptations of the popular video games they are based off of. They are light-heared, fun, and don't take themselves too seriously. If you're a fan of one, I recommend you check out the other.
There are a couple of similarities: positive main characters, detective stories, well, even being based on a video game:) Both have their flaws, but are fun and worth watching.
In the story, there is nothing in the world that the mysterious phantom thief Joker cannot steal. He goes after one treasure after another in unpredictable capers with seemingly miraculous tricks.
Kimura Yui has had a tragic life. After the traumatic death of her parents, Kimura has suffered yet another loss: her personal advisor, Kansaki. Now, lonely and distressed, Kimura wanders in the rain until she is harassed by two suspicious men – and subsequently is saved by an unknown benefactor while she faints and falls to the ground. Later, Kimura awakens in the house of her savior, the detective Takamizawa Kyosuke, who offers to help her discover the truth behind these murders…
A detective with the face of a butt, solving crimes and getting to the bottom of things.