In Another World with My Smartphone

After being accidentally killed by God, Touya Mochizuki is reincarnated in a fantasy world with a single special privilege: he gets to keep his smartphone, modified to work in this new realm. He proves to be extraordinarily talented in magic and swordsmanship, swiftly accumulating friends, allies, and romantic interests. The series is a lighthearted power-fantasy isekai with a relaxed tone and a growing harem.