Nicely done, though I'd like to list a few things that leaped out at me.
Most of them are simply matters of style, so feel free to take what you need
and ignore the rest.
-Akane is too good with the ring. She automatically knows how use it.
Remember when Kyle got the ring? He had to have Sentinel fill him in and a
lot of when he first used it was trial and error. You need to have some
scenes with Akane learning the ring. With her legendary temper, Nerima's
going to lose a few buildings to green mallets. =)
-Also, I can easily see her choosing a different costume though you're
probably correct when you had her simply choose to keep the regular costume.
-Lessee, was there anything else? Ah. Have Batman show up in Nerima to
investigate, probably with Kyle since I can't see him sitting by. His sense
of responsibilty would compel him to find out who has the ring, even if
Ganthet selected somebody else.
-Agreeable Komodo