My Reincarnation Sucks As Expected

Reincarnation isn't as fast-paced and exciting as I thought it would be. No, really. Why the hell am I a cross-dimension delivery man that's getting roped into random stuff. Also, why the hell are you using me to send death letters to Great Red you dumb Dragon God! (English is not my first language, but it is my second. Still, I can't guarantee perfect and infallible grammar. This is also my first time writing)