Yamada is a shy second-year high school girl who is a member of the greenery committee. Kase from the class next to hers is a beautiful girl who is the ace of the school's track team. As a result of the morning glories planted by Yamada, the distance between the two people who have never exchanged words shrinks little by little.
Kimi no Hikari: Asagao to Kase-san. is a promotional video of Hiromi Takashima's Asagao to Kase-san. manga, the first installment of the Kase-san Series. It features Hanako Oku's song titled "Kimi no Egao (album ver.)" from the 2012 album good-bye.
Kimi no Hikari was first released on the YouTube channel of Anime Pony Canyon on May 7, 2017. It was later bundled as a Blu-ray disc with Apron to Kase-san., the fourth manga volume in the series, on July 25, 2017.