Amongthecla.s.sthatwastransportedtoanotherworld,NagumoHajimeisanordinarymalestudentwhodoesn’thaveambitionnoraspirationinlife,called“Incompetent”byhiscla.s.smates.
　　Thecla.s.sissummonedtobecomeheroesandsaveacountryfromdestruction,studentsofthecla.s.sareblessedwithcheatspecsandcooljobcla.s.ses,butthat’snotthecasewithHajime,hisjobcla.s.sisa“Synergist”andhisstatsareverynormal(mediocre).“Synergist,”toputitinanotherwordisjusttheartisancla.s.s.
　　Beingtheweakest,hethenfallstothedepthoftheabysswhenheandhiscla.s.smatesareexploringadungeon.Whatdidhefindinthedepthoftheabyssandcanhesurvive?