How can i get to the secret characters routes?
The first thing you have to do is get Tocchan’s good ending. Then you will unlock the cheat that unlocks the secret character routes. To access these cheats (in case you don’t know), you start a new game after finishing Tocchan’s route. Then pon pon will give you a list of cheats. Activate the secret characters cheat.
Then you can interact with the characters.