Future Grimoire Summoner

Two male protagonists, no female protagonist, collection, cultivation, evolution. In a world full of future technology, Blue Star was ruthlessly invaded by other planets, causing Blue Star's technology to completely collapse. At this time, two Grimoire Summoners appeared and used their sacrifices to gain a hundred years of peace. After a hundred years, the seal began to slowly collapse. In order to prevent being invaded again, the journey of cultivating Grimoire Summoners began. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.