Hardcore gamer x unimplemented gacha = ultimate power! OGsun (Ojisan) is a middle-aged man addicted to the wildly popular RPG "Constellations Twinkling on Earth," which has sold over 35 million copies worldwide. He ends up reincarnated into the game's world by chance. With unexpected reincarnation, unimplemented gacha elements, and a story with branching routes, all his hard-earned knowledge is now useless!? A guide to an unpredictable, outrageous adventure with unparalleled freedom!