The Loser's Ultimate Magic

A betrayed salaryman reincarnates as the world's worst mage, only to discover his catastrophic failures are powering a god-eating toddler who calls him "Papa" – while his murderous ex-wife leads a cult to reclaim them both. After dying from his wife's poisoned miso soup, Kazuki Tanaka is reborn as Lucian the Worthless, a magician whose spells always backfire. But when he accidentally bonds with Lilith, a cute child who devours magic.