Hi! So we will have 13 playable characters, in the first volume there will only be four characters to play as and you can meet the other 9 characters by playing through all of their routes. We have two more volumes with four characters each planned for release in the next two years plus DLC for our last character.
In each volume, there will be a chance to play as one of the four characters. Each character will have 7 total routes (1 intro and 1 epilogue and 5 date/friend routes) so you will meet every character at least once in the first volume.