Namaiki Asahi-chan wo Wakarasetai

Story

Ryou is in his last year of high school, and he's enjoying his otaku life to the fullest — except for a certain girl who's really getting on his nerves. She goes to his school and she's none other than his cocky two-year younger childhood-friend, Asahi-chan! Though she's suppose to be his kouhai, she's always teasing him whenever she gets the chance!

Synopsis via AniList (English).