No_Existence
As for the Worlds, what about High School of the dead, tokyo ghoul even the rising of the shield hero, although that might be kinda extreme but it would be interesting since it will give mc a Fisical power up besides of his cyber powers, mc can replace Ren as the sword hero and when th priest ask about the DDLC members being summon too but not being heros you can make it look like an error that happend because they summon all the 4 heroes at once, something they shouldnt have done. also mc can boost the girls through his Legendary weapon and travel to another world once he is bored
Love it, just hope mc only keep the DDLC culb as his harem, there is no reason to make this a pokemon catching harem or to add any other girl, here it make sense for mc to make the DDLC members as his harems due to their particualr situation, but beyond that it wont make sense and personally its not necesary.