1. Get the good endings for Lyell, Bae and Victoria. these all end with a drawing of them at the dance in their costumes.
2. get the bad endings for Lyell, Bae and Victoria. these are all different. and their routes do have deaths in them that might seem like bad ends but aren't (the directions segment in victories. the mini game near the end of base route, etc). without a spoiler for their route bae and Victoria have a cg with their bad end after the last instinct/ reason choice. And Lyell bad ending involves more of her than Jaylene (really hard to explain without spoiling). on the main menu you should have three items for each of the girls as of right now.
3. play the common route and answer the questions in this order 111,333. if done right and all routes have been done before it should start automatically. if you get a choice between lyell, bae, and victoria that means you didn't complete their endings.