While I have never written a review before, I felt incredibly compelled to do so after watching the most recent episode (15) as this has quickly rose to the top of my list of the dozens of animes I have watched.
Darling in the FranXX excels and drawing out an incredible variety of emotions; it has the thrill of an awesome shonen/action series, characters each with unique (often relatable) personalities and surprisingly interesting backstories, the occasional set of humour, a beautiful combination of music, art, and animation, but most importantly a magnificent ability to tell an incredible romantic story between the two primary protagonists.
You will feel excited and frustrated, exhilarated and saddened; you will laugh and you may cry, both tears of sadness and joy; and, the more you watch, the more you will find the need to watch. It does what I have never seen any other animes do - it brings together those that watch shonens/action shows with those that watch rom-coms/slice of life animes and it seems to do it effortlessly.
Although the value of each episode may fluctuate throughout the series, stay patient as each episode is still significant and the creators excel at bringing them all together. You may first find it overly eerie but this is done purposefully and it truly makes the moments that bring you joy also possibly bring you to tears.
You may have questionable feelings as you begin to watch this series but put those feelings to rest and watch this anime as I cannot even fathom how you would regret it. This is a must-watch if there ever was one. It's pure magic.