Harmony

This is the serialized story between Nagai-kun and Hinohara-sensei, the most popular duo in 14-sai no Koi, about how they became a couple despite their age difference. It is full of dazzling and lovely portrayals of their wavering feelings (mainly Hinohara-sensei).
(Source: Hakusensha, translated)
Note: Includes 5 intermissions and 1 extra chapter.