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Uke cannot kill himself or another living thing due to his ability; Seme uses shadows and is like an assassin. Uke is held down by a past mistake; Seme wishes to control and possess Uke.
Uke adopted to be sent to the military instead of their own child; Uke fell in love with his adoptive brother, but avoided him after running the night he got into the military with a quick smex round. Uke gets stuck in a time dungeon that Seme ends up rescuing him from, which means he'd been stuck in the dungeon for what felt like weeks were several years. Seme is a high ranking official and was determined to get him back or to avenge him.
It's a cute one
Everyone has an Edeya [Soul power] ; It can be as useful as a weapon or as useless as a plunger. Each have ranks and the MC seems to be able to grow his. MC has a dark past that is slowly uncovered as he comes to understand his Edeya.
Necromancer MC; uke.
A Trace of the Wonder