Below is a walkthrough of Chapter XVII – Part II: Those of Aspiration in Triangle Strategy. This route is unlocked by choosing “There must be another way!” in Chapter XVII – Part I after meeting all the conditions for Serenoa’s ending.
For this chapter, you’ll have to divide your forces up into 3 groups led by Benedict, Roland and Frederica. Afterwards, you’ll see various cutscenes leading to the end of the part.