Necromancer Survival - Chapter 69

In her last life, she was miserable and ordinary. This time, she got into the fashion and was reborn in another world. She was still the same person… even with the same body and face. What was the point of reincarnation? A childhood companion? He always pulled her hair and made troubles for her? A handsome boy? The boy never looked at her and was 15 years older than her! A prestigious teacher? The teacher spent his days eating and drinking, coaxed, played tricks, and controlled others… Too scary and better run away? No no no, such a challenging life was bound to be wonderful! Now let me take you back to the 70s and live a fast life!

- Description from Novelupdates

Transmigrated to become a disciple of the demon sect, relying on the technique modifier to become a giant of the demon path.

[Detected the technique “Blood Nerve”, relying on devouring blood to cultivate]

[Side effect: easily affected by the spirit contained in the blood, becoming bloodthirsty, murderous, insane, and even brain dead]

[Please wait, system modification is in progress…]

[Ding! Modification completed and side effects canceled]

“CRASH!” the last sound he heard; the last image being the smile of his friends.Jotou Howllett, a twenty-one year old nobody who finds little to no purpose in his life, wants to be a freelancer to make it big whilst trying to avoid education. He spends his last day of freedom with his friends before he's forced by his parents to attend college. That last day became his true last day as a white light flashed and he opened his eyes in a coffin, suffocating. He, now she, found herself to be in the body of a woman who had recently passed away. Jotou comes to realize that she's no longer in her world and now is in some sort of fantasy world. The rampant problems in this world soon find themselves surrounding Jotou, from the magics to the monsters to the wars between kingdoms and cities. Jotou sets out to uncover how she got here, why is she here, is she stuck here? Alongside the companions she finds in her way.

Zavier met Cosmic Consciousness after his death. He was satisfied with every system that Cosmic Consciousness exhibited, so he wanted all of them. Surprisingly, the Cosmic Consciousness obliged him.

Zavier was reborn in an isekai full of magic and alchemy. Now, he had many routes to upgrade. Interestingly, to coordinate these systems, Cosmic Consciousness gave him the gift of being able to duplicate himself. He could clone a finite number of himself to manipulate these systems.

Magus, Alchemist, Mesmer, Tamer, Hunter, Vampire, Werewolf, Dragonknight, Necromancer.....

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By the way, it wouldn't appear NTR or some bullshit harem of courtships. MC of course will have harem but not for cliches.