I'm thinking on giving you the right to choose, the ending on the first chapter will be lineal (you can't choose), but for chapter II I'm thinking on giving you the choice, on the most recent paid version (v0.7) I've made a test on this, on v0.3 if you didn't see under Biwako's skirt you'll loose the scene with her on v0.7, so I will see how it develops.