What are the best ways to find information on books not originally published in English? (Kamogawa Food Detectives)

I am reading the Kamogawa Food Detectives series now, and have plans to start reading a lot more of the Japanese and South Korean cozy fiction books that have been translated into English.

There are currently three books out for the Kamogawa Food Detectives series and I was always under the impression it was a trilogy. But I just saw that apparently there's a translation of a fourth book being released in 2026.

I tried searching the internet to see how many entries into this series there are in total (even if the English translations won't be out for years), but turned up basically nothing. Even trying to search the author's bibliography only gave me the works that have been translated rather than a list of his works in the original Japanese.

I still have not found out how many books there are in the series, but I am also realizing that the more I get invested in these translated books, the more this issue is going to crop up.

Does anyone have advice on how to find information on books when they were not originally published in English? And secondarily, does anyone know how many entries there are in the Kamogawa Food Detectives series?