I'm gonna venture that's the real, alive Arika, because ghosts wouldn't really need to board a bus and all.
Welp. ... .... welp. It was a GREAT concept, it was a good work, and it was a pleasant read, but I get the impression this was supposed to go on much, much longer than it did. There's a lot of loose ends left and the typical race to the finish line ending that barely touches on the rest of the cast's fate. I think it peaked with Nana's rise to idoldom, but at some point after that I feel like something idled out, plot-wise, and never quite got back into gear before the ax fell.
Which is a shame, but what can you do. I guess we'll never see this particular story and cast revisited, but I'm glad it ended happily for Nana and Arika.
Best girl: .....aaaaaaaaaaaand STILL the champion: