災悪のアヴァロン～ゲーム最弱の悪役デブに転移したけど、俺だけ“やせれば強くてニューゲーム”な世界だったので、最速レベルアップ＆破滅フラグ回避で影の英雄を目指します～

Synopsis

The main character loves the MMORPG game called Dungeon Explorer Chronicle (Dun-Ex). During one particular day, a beta test event was announced, and he managed to beat it. In exchange for clearing the event, he was granted permission to try the beta test server. Forcing to choose different avatar and skill as the system doesn't allow his own, he eventually settled on random. However, he is transferred to a place where, as expected, he finds a fat, villainous mob character...!