From Shotachan Scanlations:

C1:
Hinata, rejected by his own parents and classmates, tries to find his own place in the world.

C2:
Hinata overcomes a fever and falls into a bad situation.

From TheRobotsGhost:

C3:
Minami and his newfound hero, Hiroo, go through another patch of rough times. This is the last book of this series.

Note: Previous books had the main character's name as "Hinata" since it’s one of the most common reading for his name kanji. The artist finally clarified the reading of the character’s name in this final book.