A young man who gets into a plane crash while returning from a business trip overseas is reincarnated into another world after being asked by the goddess to defeat the evil god.
However, he was reincarnated as a stupid prince who is known among the aristocrats as the "Pig Prince (Orc Prince)" because of his fat and ugly appearance. If you can't even do one sit-up, how are you going to defeat the evil god? This is the story of the Pig Prince's struggle to lose weight!
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Alternative:
Tereinkarnasi sebagai Pangeran yang Mengecewakan: Saat Ini Sit-up Sekali pun Tak Bisa, tapi akan Kucoba 'tuk Diet dan Selamatkan Dunia;That Time I Got Reincarnated as a Disappointing Prince;That Time I Got Reincarnated as a Disappointing Prince: Right Now I Can't Even Do One Sit-up, but I'll Try to Lose Weight and Save the World;転生先が残念王子だった件 ~今は腹筋1回もできないけど痩せて異世界救います~