The MC is a ‘vampire’, is blamed for a plague because the village he lives in is more or less safe because of him, stabs himself on the village chief’s sword to prevent them from being viewed as his minions by the church, has an immense amount of mana circuits that he keeps when reincarnating, and is reincarnated 200 years after his death. This is all in the first chapter or two (of the manga).
Henkyou Gurashi No Maou, Tensei Shite Saikyou No Majutsushi Ni Naru (The Demon King of the Frontier Life, Reincarnated to Become the Strongest Mage ~The Former Demon King Who Grows Up While Being Loved, Wants to Know Humans~ (LN))