Multiple Common Routes

This visual novel has more than one "common route". Usually, this is presented in the following ways:

1) The player selects which common route they would like to enter right at the beginning of the game.
2) The player may end up in one out of multiple common routes depending on choices made.
3) The game may have multiple protagonists, and each one has their own common route.

Normally, the individual character routes you can enter in these games will depend on the common route you have chosen/ended up in.