conan older goes to the same school as shinichi. ran's suspicious and a member of black org. come up to her, asks her some questions. reports back, vodka confronts conan and conan ends up acting as a link to the outside world for them. conan manages to destroy the org. from within when he finally got access. exploits them but doesnt' know gin is still alive. gin starts killing everyone conan was related to. on the way to prof. agasa's place, conan hears gunshots. he runs to the place and finds the prof. injured. he sees ai downstairs seriously injured. brought to the hospital, ai enters the surgery room. conan runs off to ran's place and finds the place trashed. gin finds ran and conan comes to the rescue. gin disarms all of conan's gadgets. the police come and manages to gun gin. back to the hospital, everyone awaits the results from ai's surgery. the surgery guy comes out and tells everyone that she's fine now. conan gives her the pill while everyone wasn't paying attention. few weeks later, ai creates the antidote but is only enough for one. conan takes it and turns back to shinichi permenately. after the credits, shinichi goes to ran's place and confesses to her.
this is more like the ending and last movie of the series, huh?
i find my own idea somewhat good tho~~