Ougon no Kizuna has involved big, big bosses. But while fighting huge hulks is an important part of the game, it's also characterized by much smaller tasks involving (generally) smaller characters, who then form "bonds" with Lian, the protagonist. The formation of these bonds affects the game's storyline.
Famitsu has introduced two of Kizuna's 100 subquests. The first involves helping a girl named Aliche pass her test to become a water priestess, and the second seems to involve training a group of soldiers called "Resolvers" who are currently being trained in a less-than-serious manner.