Romantica Clock

Both anime are short episodes - 1 minute each! Don't expect too much, I personally think they're both made to get you curious for the manga. 

Both anime are very short episodes about siblings. Super Seisyun Brothers is more extensive though.i 

I swear, when I first saw this I thought this was a parody version of oshi no ko. Just watch romantica clock if you want to see characters that look and have similar personalities of the twins in oshi no ko interacting like "normal family members" in two minutes. If you imagine that the characters in romantica clock are the twins from oshi no ko the experience is enchanced by 200% trust me 

-Both siblings don't get along and hate each other -Both main girl sibling character ends up in a complected situation, and that situation helped bring them closer together -Both characters begin to slowly understand each other -Both siblings character in both animes are very similar personality traits -Both animes are romantic and cute -Ore no Imouto doesn't really have much incest, but the other one is pure cute incest 

-Both involves rivalry between the guy and the girl -Both girl characters hates the guy because they are smarter than them -Both romantic and cute -Both characteristics of the male and female character of both animes are very similar -Both are very cute and romantic and kyah!  

There're both anime with just three really short episodes. Both seem to be more like an advertisement for the manga. When I watch them, I have the feeling that they're spoiling a bit, but also, they really make me want to read the manga and hope that they will make an actual anime of them (even though they have one actual episode of Hiyokoi, but it's still too short; I want a 12-episode anime). They also have the same feeling when you watch them. They're both really cute and the art styles are similar too. 

-Both main guy and girl ersonality are similar to both animes -Both anime revolves around a girl who dislikes the guy (involves rivalry) -Both romantic and very good -Both typical shoujo and cute