If you liked the sola anime, the Anime-Planet community thinks you'd like:
One day a light descends from the sky and splits into the ideal girls of Takeru and Ryou. That is where this gentle and vaguely romantic story about our ugly and beautiful world begins. Soon enough the story plummets into the secrets of global extinction and the meaning of life. Everything in this world that is beautiful has something ugly in it, and that ugliness is part of the secret of its beauty. Even for romance this is true...
I'd like to say that this is a long shot, but I really do think that these series should be recommended for each other.
For, This Ugly Yet Beautiful World, There are 2 romances that revolves in the story, Takery and Ruyko. They want to meet there ideal girls, and *poof* they get there wish. In the end, they must fight each other because there ugly "fake" love isn't real. As aposed to Sola, Yurito needs to fight 2 girls' quarels by sacurficing him as he is just a fake. Any more details will spoil the series.
Also, for Sola, there are these monsters called Yaka--imortal monsters or Calamities of the night--and have super powers; In This Ugly Yet Beautiful World, the main characters are either Alians or Humans that have super powers that can fly and fight. It's Ineditable that the Yakas fight each other just like the aliens do.
If you like either of these anime series, then be prepaired that the other series will be almost perfectly parellel. The plots in both series are very good, there one of a kind. I enjoyed, I hope you do too.
When Makoto was forced to move away from his hometown, he left his childhood friend Minamo a harmonica and a promise: they’d meet again someday and eventually marry. Years later, Makoto and his sister Hinata return to Kazune, the city of supernatural powers. When Makoto hears a mysterious yet familiar harmonica melody being played on the roof of the school, he finds himself reunited with the girl of his all-but-forgotten childhood promise. The three and their friends happily go to school, spend time together, and slowly become more and more involved in the mysteries of a city which hides a great and disturbing secret – a secret that has touched all their lives more closely than they can possibly yet understand.
Both of these anime get pretty darn dark towards the very end, girls have supernatural powers, and finally romance, as well as what happened between main characters centuries ago, plays a significant role in the plot.
Kimihiro Watanuki is cursed with the ability to see evil spirits known as Youkai. Due to this power, the Youkai are attracted to him like a magnet, and each time he is close to being devoured. One day, fate drew him to a strange store and there, he met Yuuko, who was dressed in a very exquisite fashion. As destiny would have it, Yuuko has the ability to save Kimihiro from seeing the Youkai, but for a price: Kimihiro must work for Yuuko by performing chores around the store and other odd tasks, until she deems fit. With his "friend" Doumeki, and his secret crush Himawari, they will discover that the world they live in is nowhere close to ordinary!
At first glance these two animes may not seem to have a lot in common, since Sola focuses more on friendship, family, and romance, while XXX Holic is more about magic and morality, but they actually have a surprising number of elements in common. Both deal with the supernatural and how it can invade people's lives in ways they may not even be aware of. They also both have a brilliant mixture of joy and pain, friendship and lonliness, and fun and suffering to make anyone's heart run the gamunt of emotions. The plots and settings may be different, but in terms of the vewier experience and the underlying themes, I think if you liked one, you will defintely like the other.