>one piece swim suit
Why did best girl have to be background character
Because Raku doesn't deserve her, and Based God and Savior Mako needed his own woman.
If she were a main girl she'd be in love with Raku and would get her character destroyed to stop her from confessing and the plot from the ending.
Ruri is the best girl.
This is pretty much fact.
She's not a background character you ignorant fuck.
You mean secondary main character.
Ruri has her own arcs in the manga. She's popular too, usually top 5 in polls.
Because she is too good for Raku, simple
Because someone has to mend MC's best friend's broken heart.