Before I go onto the actual review, I'd like to quickly mention that this is probably not something that you should be watching if you have photosensitive epilepsy. There's lots of instances of high-speed flashing visual effects in this anime that I found extremely irritating, with the worst instance being in the intro where there is red and white flashing.
Ling Yu's story is very hard to follow as it doesn't give much of any background as to what's happening, to the point where it almost feels you're watching the 2nd season of this show while skipping the first. Everything also moves way too fast (likely
due to the episodes being so short) and this also makes things more confusing. This show really felt like it could've used one or two extra episodes to set everything up.
There also doesn't feel like there's much if any character development, again probably the fault of the short episode length and total episode count. Maybe the only character who I'd say changes at all over the duration of the show is Tang Siqi, but even then she barely changes at all.
Then there's the visual effects, which I've already talked about at the very start of this review. The lightning in the show flashes in a way that frankly sometimes hurts to look at. Instead of doing something that could be tolerable, like having the lightning be full opacity one frame and then slightly transparent the next or something similar to that, you have brightly coloured lightning that's at full opacity one frame, and gone the next.
All in all, Ling Yu was frankly kind of disappointing. I was originally excited to watch this because the synopsis made it sound interesting, but I mostly just found it boring and confusing.