 If you liked
Sumomomo Momomo: Chijou Saikyou no Yome
|
 ...then you might like
Haiyore! Nyaruko-san
|
Similarities:
Both have a sudden girlfriend appearance genre.
Both have comedy, harem, action and school genre.
Both chiquitas (female lead) are the ones protecting the reluctant muchacho (male lead)
Both have instances where the muchacho (male lead) is reluctant to get involved with the girl but seem to be stuck with the chiquita (female lead).
Dissimilarities:
One has an extra sci-fi genre while the other has martial arts as its extra genre.
The girl in one anime is an alien and an otaku, while the other girl from another anime is a martial arts expert and good in doing household chores.
The muchacho (male lead) in the other anime has
read more
Both revolve around an OP chick that loves fighting, and has a more or less unrequited crush on the relatively normal MC; whom they are protecting. Both of the females are very quirky and often do irrational things, causing their crush to act coldly towards them. The setting is different, but both anime have specific things in common.