Koi Miru Tomoda ni Koisuru Aika

Aika Koizawa has long had feelings for her classmate Shuichirou Tomoda. But when she finally works up the courage to tell him, she discovers that he's only focused on observing other people's romance from afar and commentating on it like a sports announcer! When he's so oblivious to her blossoming love for him, what can she do to turn his eyes away from others and onto her?!  Source: Shogakukan