Hakushaku Cain Series

From Viz:
Delve into the tortured past of Earl Cain C. Hargreaves, charismatic heir to a wealthy family full of secrets, lies and unthinkable crimes. Follow the young Cain as he attempts to unravel the secrets of his birth, all the while solving each new mystery that comes his way.

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In the Hakushaku Cain Series:

1) Wasurerareta Juliet

Includes 2 oneshots:
i) The Boys Who Stopped Time -
England, year 1918. Rupert enrolls to his new school just a few days after the murder of a maid called Noelle. He's the type that just can't sit still, so when he meets Noelle's sister, he's determined to help her find out who murdered her sister...

ii) Double -
When they were children, Ren helped his friend Emilio start his career as an actor. But when Ren didn't have any news from Emilio for two years, he decided to go to New York to look for his friend...

2) Shounen no Fukasuru Oto

3) Kafka

Includes 1 oneshot: Ellie in Summer Clothes

4) Akai Hitsuji no Kokuin

5) God Child