So...is no one going to mention the rather interesting detail that bitch dropped while talking to Kamiki? She straight up says that he and her killed Ryosuke (in case you forgot that was the stalker who murdered Ai and "committed suicide" afterwards). That's another one to add to Kamiki's body count. It also directly contradicts what Kamiki said to Aqua about how he only intended to scare Ai by sending the stalker after her. If he truly had no ill intent, why would they need to murder the stalker after the deed was done unless they were trying to remove a loose end.
Also, I don't understand the logic here. So jealous bitch agreed to murder Ai because Ai should always be the top idol and by murdering her in such a dramatic way they ensure the public never forgets about her. But now her daughter is apparently "surpassing" Ai (not sure how she determines that but I'll roll with it) and jealous bitch can't cope with that because she can only handle being in Ai's shadow since she was her group mate and can't handle also being in someone else's shadow so her plan is to...murder Ruby in the same way she had Ai murdered thus enshrining Ruby in a similar way to her mother and ensuring she'll surpass Ai even harder. What.
Finally why is Kamiki calling this lady on the phone and telling her to turn themselves in, why didn't he just immediately go to the police and tell them about his accomplice and let them arrest her? The way this is set up really feels like Kamiki is just trying to convince her take the fall and deliberately pushing her over the edge in order to kill Ruby (we've seen earlier that Kamiki had plans for Ruby as well) meaning he hasn't changed at all.
A lot of things aren't adding up and it really feels contrived. Kamiki still feels like the final boss given how manipulative he's been portrayed and how unsatisfying his "karmic justice" felt with him basically just getting a free pass because Ai made a video saying she still loved him (Ai is notorious for not knowing what love is and can only truly say she felt it on her death bed specifically for Ruby and Aqua). Either Kamiki is truly some psychotic mastermind who has been manipulating things behind the scenes this entire time including the desire to murder Ruby still or shit is just being made up on the fly for shock value.