 If you liked Houseki no Kuni |  ...then you might like Shingeki no Kyojin Season 3 Part 2 |
It is hard to recommend a follow-up for something like AoT that has no real parallel, certainly in regards to story quality. However, Land of the Lustrous is something of a ‘yin’ to the Attack on Titan ‘yang’. While using a totally different colour palette and animation style, Houseki no Kuni similarly has a mysterious invading enemy, a host of meaningful characters and a strong sense of tragedy throughout. It also delivers some of the most dynamic fight scenes (sword based, I might add) that you will find!