Check BookWalker Japan or Amazon Kindle JP . Search using the Japanese title: 描く！最強漫画家はお絵かきスキルで異世界無双する (Egaku! Saikyou Mangaka wa Oekaki Skill de Isekai Musou Suru)
His ability relies on his vast mana reserves, allowing him to bypass the limits of standard mages. Check BookWalker Japan or Amazon Kindle JP
: Seeking a peaceful, "ordinary" life, he chooses to be reborn as the only son of a modest magic store owner. Check BookWalker Japan or Amazon Kindle JP