3-gatsu no Lion, Shuumatsu Nani Shitemasu ka? Isogashii desu ka? Sukutte Moratte Ii desu ka? Recommendations
While the settings are drastically different, there is a very similar general tone to each story. The protagonist in both start out more or less empty inside and try to close their heart away from the world. They both deal with their problems in a similar manner at the start as well. Both also have a similar tendency to sprinkle in more lighthearted slice of life/comedy moments into the show occasionally as well. 3-Gatsu no Lion does that more often than SukaSuka admittedly.
-Similar protagonists (not exactly the same)
-Very different story and setting