While not both in an omnibus format, both share the atmosphere, the plots and the feeling.
While Kimikiss revolves around the main male characters and each of their respectable relationships, Amagami SS revolves around the single male lead and his interactions with each girl that has a crush or strong feelings for him. Amagami SS's story is made up of arks for each girl while KimiKiss is just one story that bounces between characters. Both have similar feels to them so if you liked one then you'll like the other.
Kimikiss is effectively the spiritual predeccesor to Amamgami as bith are based on dating sims made by the same company.
It took one episode for me to immediately think of Kimikiss when I watched Amagami. Similar art, similar plot, similar genre.
Very similar premise and feel, i.e. a romance with a bit of drama and a hint of comedy. Not surprising since they're both from the same creator, which is obvious from the similar character designs. Other similarities include annoying little sisters, swimsuit scenes and perky upperclassmen who might just be hiding or denying their own feelings.
The two animes are based from a dating simulator of the same publisher company. Conversation simulators with lots of girls to choose.
Both the games are made by the same group, Enterbrain, which is why the art style and situations are really similar.
Both have the same creators. if one chooses or considers the Haruka Arc for amagami, then both haruka and mao have the common theme for being a year older than their respective boyfriends junichi and kouichi, although regardless of which arc one chooses, mao and haruka share a common theme of being the only seniors of the 2 respective groups of main heroines, plus have two freshmen for each heroine. amagami's nakata and nanasaki, and more than 2 second years. kimikiss' hoshino yuumi, eriko futami shijou mitsuki and asuka sakino and amagami's sakurai, kaoru, and tsukasa. if one follows the kaoru or the morishima
Both are about love story's in different scenarios
Both animes have a romance plot within a school setting,
Both were based on a PS2 Galge or Dating Sim game,
Both have beautiful female heroines !
I DO NOT RECOMMEND watching Kimikiss Pure Rouge if you are hoping for some happy ending romance like Amagami SS. There's really no similarities between this two anime other than it's set in a school and the same creator, also the plots are totally different. Now the manga of Kimikiss does resembles Amagami SS with the different happy endings and one only male main character.
Sorry but this recommendation will only help those who have watched Amagami SS.
Both originate from dating by the same company. Kimikiss has a complicate yet interesting love-rectangle. It still have romance and comedy components. If you like Amagami SS, you should definitely check out Kimikiss.
If you watch both of these series, it will give you a very similar feeling. Although Amagami SS only has one main male protagonist, both series has that romance/school life setting. Keep an eye on both of these series if you're a fan of dating sims filled with drama, comedy, romance, and school life.
Both are Romance, both take place at school, Kimikiss is more dramatic
If you're looking for a romance anime with MC and different Heroine(per arc) then this will bfit your bill
Both Main Male Lead dates a different heroine every arc
Both anime contains the same school setting
Both anime contains drama
All in All this is a great anime to watch especially if you're into dating sims
While Kimikiss doesnt follow the same style in terms of giving all the main heroines their own arc. Both shows have a similar sort of feel in terms of atmosphere and main characters