OK BUT THIS WAA SO GOOD!!! could someone recommend me more of this type of rivals-ish to l...

No, they are unique, i really tried to find something similar. If u get anything let me know too please ヾ(☆▽☆)

http://www.mangago.zone/read-manga/abarenbo_honey/
http://www.mangago.zone/read-manga/junketsu_drop/
http://www.mangago.zone/read-manga/renai_rubi_no_tadashii_furikata/
http://mangago.zone/read-manga/omae_no_koi_wa_ore_no_mono/
http://www.mangago.zone/read-manga/muka_tsuku_douryou_to_sefure_ni_narimashita/
http://mangago.zone/read-manga/ore_no_kirai_na_senpai/
http://www.mangago.zone/read-manga/dakaretai_otoko_ichii_ni_odosarete_imasu/
http://mangago.zone/read-manga/kujira_no_oshitate_san/

honestly some of these aren't rival stories per se, but all of these i've read (don't fully remember tho) that i found after some digging (=・ω・=)

or just check out this tag page? http://www.mangago.zone/tag/rivals/?page=1