Shironeko Project: Zero Chronicle

Because they are of the fantasy genre that share a similar premise and setting. Even though both shows setup a fantasy world with two divided factions at war with one another, the story focuses more on a Romeo x Juliet type romance. Two characters, one from each faction, trying to find peace or some common ground are also ordered to fight their adversaries. However, after their fateful encounter, these “enemies” grow fond of each other; becoming friendlier and more open with each other after each meeting. Even so, they have to live up to their duties as enemies destined to defeat the other. Both shows primarily focus on romance, but they also have similar mix of action, magic, fantasy elements, & slice of life moments.  read more 

Both shows draw heavy inspiration from Shakepeare's Romeo and Juliet while mixing in heavy fantasy elements and taking place (partially) on a floating island that somehow eventually becomes involved in the plot. The main difference seems to be how many episodes did each one get to tell the same story. 

sorry if i am very bad tat writing recommendations. The plot is kind of like the same to Shuumatsu Nani Shitemasu ka, and the "drama" also appears mostly at 1 to 2 last eps. The drawing is not bad, it's a little bit above decent. I don't know, watching this just makes me recall of the despair i had whist watching Shuumatsu Nani Shitemasu ka.  

Both show are very similar in the aspect of divided love. In each show the male and female protagonist are separated by some "societal divide". Whether that be another country or a another world, each protagonist loves the other, and is willing to do anything for them.