Birth Of The Legends [Book I] (High School DxD x SCP Foundation) [AU]

[REWRITING] Adam Rose, a young man member of the Navy SEALS, didn't know what fate had planned for him. Trained to kill since he was a child and with a vengeance against nightmarish beings, his life was destined just to death and desperation. Having seen incredible things, he wasn't expecting such a sudden change in his life. A ridiculously powerful organization that protects humanity, people from the past, a cute devil, chaos, and family. At least his life won't lack thrill.
Elements and/or characters from other franchises such as RWBY, Splinter Cell, and Metal Gear Solid.