The H.I.M.E.R.A project, special creatures derived from human DNA and the DNA of "True Chimeras" that help fight them in order to protect humanity from total extinction.

The year is 20XX. Soldier, you need to bind yourself to the Chimera with a contract, not just temporary, but full-fledged, in order to join this endless war and fight on an equal footing with others. Your Chimera, to match you, will take the form of any weapon you can squeeze out of your pathetic body. A sword, a shotgun, a pistol, shurikens and more.

Is the task clear to you, soldier?

P.S. You're lower in rank than Alexander, anyway, but that doesn't stop you from writing your story so that you're not just a rookie, but someone more serious.