With so many choices these days, it's only natural to feel overwhelmed by the decision between them. That's why we have the third-option love interest. If you ever get fed up with two girls that everyone (including the writers) ships, you can always pick up the third option's relationship and ship it proudly.
In addition to Marika, we have Tsugumi as a possible Third Option:
Some other third options in recent history:
Ayase, Guilty Crown
Otome, School Days