Had a whole saga getting into this one—ended up using Kindle Unlimited for the first chunk. Honestly, Amazon's the safest legal route; they have the official e-book, plus you can buy or borrow it if you subscribe. I know some folks are hesitant to give Bezos more money, but it's the most direct method for the English version right now. Rakuten Kobo should have it too, but I haven't personally checked.
There's also the official serialization on Manta, the comic platform, which sometimes offers novel adaptations or previews. I'm less clear on the novel's full presence there, though. A friend mentioned seeing bits on Radish, but that's more for serialized snippets. My advice is to stick with the major retailers to ensure the author gets proper credit and compensation.