Her passed away news was really on time to push him into confessing. Coincidence? A lie? Also, nice to see more returning characters here, but hey, where's that screw-loose detective Yukimura? He gave up on Kindaichi just like that? I want to see where he keeps accusing Kin, while Kin just goes on with the cases with frustation because he couldn't talk back. Eventually, a case requires the help of both and they can finally come to an understanding.. because maybe Akechi wouldn't be Kindaichi's "police hand" anymore here, just like the heroine changed (Miyuki to Hayama).
Eh, what do we know anyway. Thanks for translating.