As was evident by around the half way point of the anime series, all the content of the Little Busters! visual novel by KEY was far too much for just one season, with Studio J.C. Staff confirming a second season titled “Little Busters! Refrain” for release in the future. Similar to how the second season of Clannad was named Clannad: After Story – Refrain is the name of the final chapter in the visual novel which is unlocked upon completing all the six character arcs and brings to light many mysteries which you would have already seen watching the first season.
Expect to hear more about this in the future as details are still limited.