That was absurdly and unbelievably cute.
I love how all the girls doted on Hikari. Mahiru isn't jealous because she's in big sister mode. Claudine cheering because her bed is Hikari's favorite. Karen holding her non-stop. Hikari being showered w treats, weepingly thinking she doesn't deserve to be friends with them all. And then the sheer relief that it was all a dream and immediately Hikari picks up Karen lol
I wonder if this AU continued, would she have returned to her normal body after regaining her brilliance?
Hikari: "Look! I'm a teenager like you all!"
Everyone: "...No, you're still our little Hikawi-chan <3"
Hikari: "Oh bloody hell!"