i think this is some weird version of the series' finale (pre-rebellion) where madoka stayed in some altered form. 7 years late.
So...You're not as smart as I thought.What's the meaning of me becoming an underlay and sliding?My, don't you get it?For the sake of their family harmony, they should avoid recreational activities that involve money, no?So the least you can do is to willingly accept the role of a sled!So then what do I gain from it, huh, Homura!?Madoka was adopted by the Kanames... Then again, she's still quite awkward with them.There's nothing better than having fun around this river, a place where she's deeply attached to.