Episode 30 (5/18) Kikaider Crossover Episode
This episode takes 2 weeks before the events that occurred in Helheim. Kouta meets a humanoid robot who doesn't seem to remember anything than his own name, Jiro and he decides to help him.

Episode 31 (5/25) No tentative title yet
Sid overhears from one of the overlords that the "Fruit of Knowledge" has the power to give someone the power to remold the world and become a god and Roshuo is guarding the said fruit. Sid devices a plan to steal the fruit while the Overlord Demushu has left Helheim to wreck havoc in Zamawe city. Source: Jefusion

I have a few theories that Takatora isn't dead,
1. His body will somehow be rescued by Kouta and he'll be saved..again, somehow his body will wash up to shore.

2. Another theory is that he is PROBABLY still alive is because of the Belt, The belt does provide body with nutrition and if Takatora is somehow saved, he'll probably say that the belt also allows underwater breathing and all that..hey..its a fiction show..anything can happen, okay? I want him to live!

3. This theory is what revolves around the beginning of the first episode, If that is supposed to happen at somewhere near the end of the show then Takatora will somehow be saved and Mitsuzane will probably turn good, maybe when Mai is used as a test subject by Redue he'll see the light..and side with Takatora again..but anyways.

I really do hope Takatora Kureshima..is alive..

And Mitsuzane Kureshima is officially the most heartless person in this show