I wanted to say I saw this coming, but from the end of the chapter, not completely. Still, ever since Yotsuba stopped being a supporting character, it felt obvious to me that it would be her. As for Fuutarou, I never expected him to be so straightforward so soon, with the set in stone rule that the MMC in a harem manga has to be dense in some way or another. I admit, I wanted Miku, especially when she stopped attacking her own ego. Makes kind of sense for the supporting character here to be the end choice, as it would allow a curveball for those who couldn't foresee or guess Yotsuba.