Ff
https://www.mangago.me/read-manga/sekimen_shinaide_sekime_san/
It's a cute romance, idk if it's shoujo tho. But definitely non toxic, enjoyable, and no second male lead
The cover is kinda misleading, but it's not ecchi or smut
https://www.mangago.me/read-manga/do_chokkyu_kareshi_kanojo/
https://www.mangago.me/read-manga/yankee_kun_to_hakujou_gaaru/
https://www.mangago.me/read-manga/hatsukoi_maze/
https://www.mangago.me/read-manga/wakeari_senpai_no_kanojo_ni_narimashita/
https://www.mangago.me/read-manga/hajimete_koibito_ga_dekimashita/
I loved “daytime shooting star”
recommend me non toxic and enjoyable shoujo mangas pleaseee with preferably no second male syndrome