I Don't Know Which Is Love, Vol. 1 (manga)

With high school graduation approaching, Mei Soraike tries to confess her love to her best friend for whom she had long harbored a secret crush...only for her hopes to be crushed. But a little heartbreak is fine-because she'll absolutely, definitely, without a doubt get a girlfriend in college! And no sooner does Mei set her resolve than potential prospects start sidling up to her one by one...?!