![](https://i.mydramalist.com/jQWPQJ_4t.jpg)
![](https://i.mydramalist.com/vlQ88_4t.jpg)
Both are train themed shows that are rather lighthearted and both are by the same writer.
![](https://i.mydramalist.com/b3eKEt.jpg)
![](https://i.mydramalist.com/Rnr6o_4t.jpg)
Gen Urobuchi has stated that Black was a huge influence on Gaim - specifically, the duels between Black and Shadow Moon were what influenced the show's writing. Plus, Kouta is very similar to Kotaro, and Shadow Moon has a counterpart in this show as well (I cannot say who as that would spoil things).