Kimi no Yokogao wo Miteita

Hikari's your typical freshmen in high school who's been recently daydreaming about Mari's, her shy best friend, love story. She decides to ship Mari with Ootani-kun, their classmate, after finding out about his crush on Mari when his friend, Asagiri-kun, tried getting the two to talk. The main character is Mari, the leading man is Ootani, and Hikari is the typical best friend in the story. Not bad... right? A youthful story between four kids going through unrequited love.

(Source: Kodansha, translated)