From Seven Seas:
Experience the world of orange from a whole new perspective, as the fate of the present and future timelines unfolds from the point of view of the ever-cheerful third wheel, Suwa Hiroto. Reuniting years later in college, Suwa and Naho’s lives have been forever scarred by their experiences in high school. They say time heals all wounds, but sometimes, time is not enough.

The 6th and 7th volumes of Orange.