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There is a fated ring . The MC has a crush on his best friend but gets fated to his best friend's brother while the brother has a crush on the mc . It is a bl manga
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A Link Between Relationships
https://www.mangago.zone/read-manga/a_link_between_relationships/
It has a name like I was reborn as a character in my sister's game
The guy goes inside a game n then his sister follows...??
I gotchu.
https://www.mangago.zone/read-manga/stuck_in_my_sister_s_dating_sim/
Maybe it's this? ╮( ̄▽ ̄)╭
U did
Yay ✧◝(⁰▿⁰)◜✧ (ig?)