Sabikui Bisco, Vol. 10 (light novel): Promise — Shinji Cobkubo

The villainous N'nabadu's schemes have left Bisco on death's door and Milo trapped in a parallel universe. Even worse, the enemy has brainwashed Sugar into helping him! While the situation may seem dire, by now, everyone knows that the world's most powerful mushroom keeper won't give up so easily—yet N'nabadu proves to be just as stubborn. When their convictions clash, the curtain rises on the greatest battle in history.