The story will feature five possible ritual/love interests, each with their own stories and relationships to explore. There will not be set 'routes' in the traditional sense. Rather, the player will choose among the lot who they spend time with during each day as the story unfolds. Certain actions, as well as how often an individual character is chosen, will affect your affinity with that character, progressing their story and deepening your bond.
There is no set outcome for these lads; their hearts can be broken, they might fall in love, or they can simply fulfill their duty of assisting the player in the final ritual. It's up to you.