In Natsume Isaku's first work, No Colour, we follow the developing relationship between an energetic young photographer and a supergeek uni student which starts as a mere neighbourhood acquaintance and gradually turns into friendship and more. 
(Source: Simona's BL Research Lab)

Hardworking, good-looking, and heir to daddy's company, Shimano thinks his life's just about perfect. Except that he's working from the bottom up in the company, and he can't seem to get along with Kurokawa, his manager. Competent but flippant, Kurokawa always seems to pay extra attention to Shimano, whether it's teasing him to make him work harder or covering up for his mistakes, which of course drives Shimano crazy. So he has Kurokawa firmly blacklisted until he realizes that Kurokawa's private life isn't a bundle of roses and begins to sympathize...and how are you supposed to hate someone you sympathize with, anyway? 
(Source: Vices &amp; Devices)
 
Note: Includes two crossover chapters featuring the main couples from Ameiro Paradox and No Color.

The self-destructive type, Sougorou is the heir of one of the well-known families in Kabuki world. He has no interests in other actors his age with the exception of Gensuke who he recognizes as his rival and never wants to lose to no matter what. However, fate plays a cruel trick on him and the two of them end up as classmates... How will their relationship develop...? 
Note: There are two different endings to this manga. The difference starts in the middle of the last chapter. The tankoubon version is a bit longer and more fleshed out compared to the magazine version.

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