Return trip ticket Kurobe Alpine Route

Can l book return tickets for all transportation from Dentetsu Toyama to Kurobeko online or through the Kurobe Alpine Route website?

Only one-way tickets are currently on sale during the "pre-sale" period. I am not sure whether it will change once the route opens, but I doubt it.

Thank you for replying!

So if I want to buy tickets for this route, how do I buy tickets that go from Dentetsu Toyama to Kurobeko, then from Kurobeko back to Dentetsu Toyama? Is it possible?

You can buy them on the day at Toyama Station. It is explained here:
https://www.alpen-route.com/en/transport/ticket.html

At a later point I think it may become possible to purchase online, but currently the pre-sale is available only for the section all the way to Ogizawa.

Your reply is much appreciated.

Is there any chance that the day tickets for return trips will be sold out?

No, tickets don't sell out. The only thing to keep in mind is - especially on busy days - that online reservations for riding the first cable car from Tateyama Station can be made. Without a reservation, you may have to wait multiple departures on busy days. So, it is recommended to make these reservations. In past years, these reservations could be made separately from the ticket purchase. Not sure about this year, because the Web ticket system has currently information about only the pre-sale tickets.