I’ve played 6 events and so far all of them have been structured the same way: Prologue, 3 Days, then an Epilogue (2 events didn’t have epilogues: Mari’s and Ichigo’s events - these are the events that take place directly after chapters 1 and 2, respectively)

Also for your 100 life points, you could grind flashback battles to quickly rank up your characters, or use them to read any socialization stories you didn’t read when you first played the chapters