 If you liked
Kanojo mo Kanojo
|
 ...then you might like
Koi wa Futago de Warikirenai
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Both anime shows that to love the boy or win his heart they have to fight for it with all they have which is basically like a two time thing whereas gf gf is showed where two girls like the boy and the boy like them too and Love Is Indivisible by Twins show where both twins like the guy and both decided to kind of shared spending time with the guy as fair competition to win him over.