Himouto! Umaru-chan, Shinozaki-san Ki wo Ota Shika ni! Recommendations
For both series, there is an amusing themes that relates to otaku. It is a main focus as otaku culture is a prime way to express both series' ideas. The main female protagonist from both series also share similar traits including their popularity (formerly for the case of Shinozaki). Both series also has a slice of life-style in ways of their storytelling that cleverly convey humor.
Daily life of an otaku girl alone or with someone who knows. Both of these manga shows you daily life of an otaku girl and those around her, however in Shinozaki-san she was not an otaku in the beginning but as the manga progress she began studying anime/manga to be-able to keep up with her newly found otaku friends.
They both have the main girl that hides their true self, such as in Himouto when she is outside of her home she's a smart elegant girl but when shes home she's a complete otaku child. In Shinozaki, She doesn't know anything about anime or manga
Both of them are imouto.
Both of them have reliable aniki (in shinozaki, you will find out after some chapters).
Both of them have simple comedy about friendship.