Jijou wo Shiranai Tenkousei ga Guigui Kuru.

Nishimura Akane is a black sheep in her class, and not a day passes without her classmates picking on her. But Takada Taiyou is new and has no clue why they would treat her that way. Will his straightforward nature become a ray of sunshine in Nishimura's gloomy days? Let their wholesome story bring you back to the carefree times of your youth!
(Source: MANGA UP!)