That's the ultimate goal sought after by each of its six main characters, who all hold some sort of secret in their past that they hope to one day make up for. In contrast to the game which this probably immediately reminds you of, the PC oddball Omikron, Tsugunai appears to have a smaller scale and tighter focus. The larger story of Reis' progression is built out of a series of smaller adventures, as he possesses different people and tries to solve their individual problems. The stage is small enough that you'll encounter several characters more than once, though. Somebody who plays a supporting role in another character's scenario might turn out to be the person you possess for another side-quest.
Some scenarios are short and simple, others are more complex.
Shades of Shenmue in that particular case. Other quests are more conventional fantasy adventures, though, involving dungeons, demons, hunting for treasure, slaying hideous monsters, and so on. It's those certainly require proficience in combat. Tsugunai, to go along with its realtime 3D visual presentation, includes some twitch elements in its combat system, particularly where defense is concerned. The kind of timing required varies from enemy to enemy, so this likely won't grow so monotonous as the analogous attack system in Legend of Dragoon.