Volume 2 Extra

This is the extra chapter of I Hear the Sunspot: Theory of Happiness.

Plot
This extra chapter dives into Taichi's and Kōhei's time in high school. How Taichi struggled to get and keep a job to maintain himself and how Kohei dealt with his hearing impairment.

In the end, it shows that Taichi and Kōhei have crossed paths before.