Miss Spide

my no. 1
https://www.mangago.me/read-manga/ouroboros/

more:
https://www.mangago.me/read-manga/dorohedoro/
https://www.mangago.me/read-manga/i_will_die_soon/
https://www.mangago.me/read-manga/efforts_never_betray/
https://www.mangago.me/read-manga/shin_ai_naru_boku_e_satsui_wo_komete/
https://www.mangago.me/read-manga/zankyou/

In terms of non BL, probably this:
https://www.mangago.me/read-manga/takemitsu_zamurai/
The artists pretty popular, so this work being relatively unknown is a bit weird.

I agree on Zankyou, probably my number one underrated.

[All SL, sorry in advance if you read them already!]

https://www.mangago.me/read-manga/pochamani/
https://www.mangago.me/read-manga/guomin_laogong_dai_huijia/
https://www.mangago.me/read-manga/senryuu_shoujo/
https://www.mangago.me/read-manga/palace_meidi/
https://www.mangago.me/read-manga/bread_butter/
https://www.mangago.me/read-manga/brothers_and_sisters/
https://www.mangago.me/read-manga/dear_only_you_don_t_know/
https://www.mangago.me/read-manga/paperbag_kun_is_in_love/
https://www.mangago.me/read-manga/sugars_yamamori_mika/
https://www.mangago.me/read-manga/dame_na_watashi_ni_koishite_kudasai/ & the sequel https://www.mangago.me/read-manga/dame_na_watashi_ni_koishite_kudasai_r/
https://www.mangago.me/read-manga/bonnouji/
https://www.mangago.me/read-manga/match_made_in_hell/
https://www.mangago.me/read-manga/can_t_see_can_t_hear_but_love/ (warning though you will ugly cry A LOT)

& some more

https://www.mangago.me/read-manga/five/
https://www.mangago.me/read-manga/magico/
https://www.mangago.me/read-manga/seiten_kickoff/
https://www.mangago.me/read-manga/shinshi_doumei_cross/
https://www.mangago.me/read-manga/nekota_no_koto_ga_ki_ni_natte_shikatanai/
https://www.mangago.me/read-manga/koi_dano_ai_dano/
https://www.mangago.me/read-manga/hayaku_shitai_futari/
https://www.mangago.me/read-manga/nise_kioku_soushitsu_no_hachiyo_san/
https://www.mangago.me/read-manga/sukinako_ga_megane_wo_wasureta/
https://www.mangago.me/read-manga/usotsuki_lily/
https://www.mangago.me/read-manga/ojiichan_shinanai/
https://www.mangago.me/read-manga/elkon_the_lonely_elf_s_marriage_hunting_diary/
https://www.mangago.me/read-manga/momoiro_ningyo/
https://www.mangago.me/read-manga/the_story_between_a_dumb_prefect_and_a_high_school_girl_with_an_inappropriate_skirt_length/
https://www.mangago.me/read-manga/sarashi_asobi/
https://www.mangago.me/read-manga/onizuka_chan_and_sawarida_kun/
https://www.mangago.me/read-manga/shiawase_kissa_sanchoume/

https://www.mangago.me/read-manga/my_broken_mariko/ https://www.mangago.me/read-manga/run_way_no_yukue_wo_shiritaika/ https://www.mangago.me/read-manga/family_now_and_forever/ https://www.mangago.me/read-manga/kimochiii_tte_nihongo_de_nante_iuno/ https://www.mangago.me/read-manga/kimi_no_yoru_ni_fureru/ https://www.mangago.me/read-manga/houkago_no_etude/ https://www.mangago.me/read-manga/dousei_yankee_akamatsu_seven/ https://www.mangago.me/read-manga/kemono_wa_oku_made_nakasaretai/ https://www.mangago.me/read-manga/rumspringa_no_joukei/ https://www.mangago.me/read-manga/oniisan_no_koto_sukinano/ https://www.mangago.me/read-manga/reverie_in_a_deserted_bus/ https://www.mangago.me/read-manga/my_god/ https://www.mangago.me/read-manga/shiba_kun_to_shepherd_san/ https://www.mangago.me/read-manga/the_paper_plane_which_is_under_the_rainbow/ https://www.mangago.me/read-manga/hot_and_cold/

vassalord

The Missing O

idk if it’s considered ‘underrated’ but it’s definitely not talked about enough, it’s SO GOOD. if you haven’t read it, READ IT.

It’s so long