Toki Nazumi, Futari Nazumu.

Overview

The same elementary school in sixth grade, Kasuga, Ling, Moe Groups are good friends. Peppy Ling is a girl that loves Kasuga. But Ling is not the gentle nature of Moe in the list, the same as her private junior high school. But wasn't it Kasuga's gentle-natured that erupted in the list, the same as her private junior high school. 3 years ago Three years later…. Indelible feeling of the Kasuga Ling, Ling and Moe are attending the same private high school. (Source: M-U)

Source: AniList