たったひとつの君との約束 ～また、会えるよね？～
-Description
Mirai, a 5th grader in primary school is being hospitalised due to a connective tissue disease. One day, she met a soccer boy named Hikari. This feeling she's feeling for the first time keeps making her heart skip. Adapts the first volume of the Tatta Hitotsu no Kimi to no Yakusoku light novel series.