I wished Nakatani would at least have told a bit more about Haru-chan. I would still purchase the 3rd spin-off about Sayaka even if Nakatani had published a full resume of Haru-chan in this chapter.
Sayaka's girlfriend should be mentioned in the 3rd spin-off of YagaKimi, which is said to be available in Sping 2020.
The coloured image of Yuu and Touko's backs heading toward the new future makes a really good phone wallpaper.