Here is a list of all related documentation pages:

Introduction
Design: Flow of the Game
Design: Characters
Design: Sprite Sizes
Extra: Making Your Own VN
Notes: Dev Progress
Notes: Initializer List vs Vector
Notes: Miscellaneous
README (git)
Inos Character
Inos Character (maybe)
Kanades Character
Kanades Character (maybe)
Rikas Character
Rikas Character (maybe)
Rins Character (maybe)
Story Unlocks
Rins Character