Isekai Manga:
http://www.mangago.zone/home/mangalist/802678/
http://www.mangago.zone/read-manga/tearmoon_empire_story/
http://www.mangago.zone/read-manga/tensei_shitara_slime_datta_ken/?MReA
http://www.mangago.zone/read-manga/maou_ni_natta_node_dungeon_tsukutte_jingai_musume_to_honobono_suru/
http://www.mangago.zone/read-manga/the_hero_who_seeks_revenge_shall_exterminate_with_darkness/
http://www.mangago.zone/read-manga/kage_no_jitsuryokusha_ni_naritakute/
http://www.mangago.zone/read-manga/i_ll_become_a_villainess_that_will_go_down_in_history_the_more_of_a_villainess_i_become_the_more_the_prince_will_dote_on_me/
http://www.mangago.zone/read-manga/the_wolf_lord_s_lady/
http://www.mangago.zone/read-manga/otome_game_no_hametsu_flag_shika_nai_akuyaku_reijou_ni_tensei_shite_shimatta/
http://www.mangago.zone/read-manga/jishou_akuyaku_reijou_na_konyakusha_no_kansatsu_kiroku/
http://www.mangago.zone/read-manga/remonster/
http://www.mangago.zone/read-manga/nidome_no_yuusha/
http://www.mangago.zone/read-manga/koushaku_reijou_no_tashinami/
http://www.mangago.zone/read-manga/the_villainess_want_to_marry_a_commoner/
http://www.mangago.zone/read-manga/isekai_yururi_kikou_kosodateshinagara_boukensha_shimasu/
http://www.mangago.zone/read-manga/seijo_no_maryoku_wa_bannou_desu/
http://www.mangago.zone/read-manga/the_villainess_falls_for_the_notorious_noble/
http://www.mangago.zone/read-manga/the_world_of_otome_games_is_tough_for_mobs/
http://www.mangago.zone/read-manga/milady_just_wants_to_relax/
http://www.mangago.zone/read-manga/kamitachi_ni_hirowareta_otoko/
http://www.mangago.zone/read-manga/this_time_i_will_definitely_be_happy/
http://www.mangago.zone/read-manga/the_result_of_being_reincarnated_is_having_a_master_servant_relationship_with_the_yandere_love_interest/
http://www.mangago.zone/read-manga/sengoku_komachi_kurou_tan/
can anyone recommend some super underrated isekais? and preferably not very popular ones, because if it's popular, I probably have read it