One of the guys name is Kazuaki. It's from a game called Hatoful Boyfriend. Hope this helps!
(a simple Google image search helped) :D
Ok, I find that their name are Lens and Diabolism and the art was done by Kazuaki. I also find that it's a book but the page is in Japanese so I don't understand all : https://www.goodreads.com/book/show/17567901-ix
I find an english page, and it's a novel written by the author of Deadman Wonderland and it's in 12 volumes (finished) : http://myanimelist.net/manga/92628/Lens_to_Akuma/pics
"On a planet far away from earth, human summons devils for various purposes. Using a colourless, transparent lens they summon the devils, the devils born from the dusts hovering on earth , and would fill the emptiness of their summoners.
Elva came home to "The Dazzling Metropolis" Bulltielle. He lived with his father Chebiat in the city. But without even noticing it, his return to his home city is the beginning for him being entangled in the mysteries which caused the death of his father 6 years ago. Tecky, a girl who know about his father, helped him and looks like she also know something about a lens that Elva's father left. This lens will be the sole key guiding him through fierce battles... "
and to finish (I don't know if it's tranlated in english yet, don't have the impression) :
Lens to Akuma
Lens and Diabolism
レンズと悪魔
Author: Mutsuzuka Akira
Illustrator: Kazuaki
12/12 volumes – complete
“Won’t you form a contract with Luna Luga? The Diabolish Party will start.” Homecoming to Blutiell city, Elba is attacked in succession by devil summoners. They are superpower users who summon a unique organism armor after equipping lens with a strange crift (pattern) engraved on them. In a grave moment Elba is saved by a girl Tekki, who invites him to Babel Hythe Museum built on an unnumbered plot of land. Then, Elba awakens his father’s memento, the lens that Elba carried under cover in his eye, and together they approach the fight, but…!? The gun apron for the Daemonisch battle, will be now cut down!
Does anyone know what this is from ? (manga/anime/game/personal creation ?) Thanks! http://i6.mangapicgallery.com/r/newpiclink/neo_arcadia_yami_ni_saku_niji/6/e37a0598dd45a07c0d69c8032fd560b2.jpeg