Kanojo no Koi ga Kanaeba Ii noni

High schooler You Nanase has always supported her best friend Misaki Watano's unrequited love, even though she's been in love with her the whole time... She is her dearest friend and the love of her life, but if Misaki's love were to come true, You could finally give up on her feelings. A coming-of-age love triangle between three people who are torn between friendship and love!

(Source: Kodansha, translated)