Pirate: I Am Roger's Son, Admiral!

Seven years after traveling to the world of One Piece, the ordinary Ige thought he could just live his past life like this. But it was not until three days ago that Iger learned that he was actually the twin son of the late Pirate King Roger! Ace is his brother, and the cheap dad who has been taking care of him is Long. He has to be called Grandpa Garp! Suddenly, Ige was confused. "Ding, congratulations to the host for obtaining the Wanjie Check-in System!" "Ding, the check-in is successful, and the reward of the Shasha Fruit ability is LV6!" "Ding, the check-in is successful, and the Supreme Swordsmanship LV5 is rewarded!" "Ding, the check-in is successful, and the Thunder Fruit ability is rewarded at LV6!"... As the daily check-in progresses, Ige becomes a naval admiral!