Mitou Shoukan://Blood-Sign - Volume 7, Battle Tutorial

Lyle Walt is a young noble boy and heir looking forward to the day he can inherit his family’s territory. Except around when he was 10 year old, his parents started neglecting him more and more in favour of his little sister, Celes.
On his fifteenth birthday, he is challenged to a duel by his sister to see who will inherit the household and horribly loses, being cast out of his family. Afterwards, he gets treated by the family groundskeepers and receives the family heirloom Gem from him that Lyle’s grandfather had entrusted to him. From there, he begins an aimless journey with his childhood friend and former fiancée, Novem, and the Gem-turned-Jewel that houses the memories, personalities, and Skills of seven of his ancestors.

Before going to college, an ordinary high school student went to celebrate and got drunk. When he woke up, he found himself in a completely different world. There was a big sect, the approaching sect entrance examination, a slum where his body’s previous owner lived, and a shared memory about a missing young girl.

Gods choose those with natural talent; demons choose those who never give up.My name is Dylan Chen, a person chosen by the demons. Of course, you can also call me “Ghost Guest.” On the road of reincarnation, just mention my name, and the guards of the netherworld will make way for you.That day, I asked the heavens three questions, and the celestial beings and Buddhas remained silent. Then I knew there was no longer a place for me in this world. Therefore, I have no choice but to kill them all!Better to live a complete life as a mortal than to be an immortal for eons! This immortality, I shall not pursue!

Okay, so I know I applied to become a caretaker, but I didn't sign up for having to experience all these crazy things! I'm just a simple guy!