Mamahaha no Tsurego ga Motokano datta

How the protagonists reconcile their feelings after a failed relationship. 

This is perhaps one of the most obvious comparisons made by multiple people. And for good reason! Both stories are around characters who used to have a romantic affair and then suddenly became step-siblings due to their parents remarrying each other. And of course, all the sexual tension their respective past affairs have left within their hearts. Both stories are very serious-minded. There is some space for laughter, but they are also quite serious. Even DomeKano which is based on a manga. 

Romance anime involving two people who become step siblings when their parents remarry. 

, Both have almost identical stories, Both stories are about love between half-siblings ,  

Both have almost identical stories, Both stories are about love between half-siblings 

I never check which studio makes whatever show, but the character design and animation of Tsurekano just screamed at me of Jaku-Chara Tomozaki-kun. And then I checked just in case to find out it was made by the same studio - Project No. 9 Both stories are based in LNs, which is very self-evident from the first couple of episodes. You simply do not have this type of complex monologue and dialog in manga. Mind you, it's not a "fun" story in the sense of lightheadedness that often characterizes manga, but it's very enjoyable on other levels. Ones of morals, difficult personalities, etc... I personally really enjoyed Jaku-Chara Tomozaki-kun and wanted to see a similar story, so Tsurekano fit that bill perfectly. read more 

,Both have almost identical stories, Both stories are about love between half-siblings,