this is so underrated WHATTT also the two researchers looks like the characs in “I'm ban...

i just realize that this manga n that were made by the same author

They are parallel versions of them
https://www.mangago.zone/read-manga/i_m_banging_my_rival_from_a_parallel_world/uu/br_chapter-186433/pg-1/
They were even in one of the chapters

And in on of the chapters we even get a confirmation that it takes place in a apocalypse https://www.mangago.zone/read-manga/i_m_banging_my_rival_from_a_parallel_world/uu/br_chapter-186437/pg-1/ also they show up in extra chapter

And in one of the chapters we even get a confirmation that it takes place in a apocalypse https://www.mangago.zone/read-manga/i_m_banging_my_rival_from_a_parallel_world/uu/br_chapter-186437/pg-1/ also they show up in extra chapter ヾ(❀╹◡╹)ﾉ~

And in one of the chapters we even get a confirmation that it takes place in a apocalypse https://www.mangago.zone/read-manga/i_m_banging_my_rival_from_a_parallel_world/uu/br_chapter-186437/pg-1/ also they show up in extra chapter
ヾ(❀╹◡╹)ﾉ~

yes ! ive reread it already to confirm