Gift: Eternal Rainbow

Two romantic comedy dramas (Heavier emphasis on drama rather than comedy) anime that revolve around sis-con (Sister-Complex) relationships between the male lead and female lead. Both stories also occur in a similar setting involving a town or city that grants people's wishes or desires due to a mysterious or magical object. There are many similar character archetypes and personalities to be found between both anime as well, and the visual artstyle is strikingly similar. 

first off, both gift and da capo has a brother-sister complex. In Gift the couple is Riko and Haruhiko, in da capo the couple is Nemu and Junichi , both of the anime have siblings as a couple. Second, in gift, the magic that grant wish is the unfaded rainbow, rainbow that always show up, meanwhile in da capo, the magic based on the undying sakura tree, sakura that always blooms. Third, both in gift and da capo, the male protagonist is being around some girls. In Gift Haruhiko surrounded by Riko, Kirino, Chisa, Rinka, Yukari and Nami. In da capo Junichi surrounded by Nemu, Sakura, Miharu, Moe, Mako, Misaki and Kotori. Fourth both in gift and da capo, the male protagonist has 1 friend (a guy, not a girl) . In Gift Haruhiko's friend is Masaki, while in Da Capo Junichi's friend is Suginami. Fifth, both in gift and da capo, there are the victim and the psyco . Both the victim in gift and da capo is the sister. In Gift the victim is Fuko, Haruhiko's younger sister, and the psyco is Kirino, haruhiko's childhood friend. In Da Capo the victim is Nemu, Junichi's younger sister, and the psyco is Sakura, Junichi's cousin . Many of similarities in both Gift and Da Capo, those five is the one i remember, so if you like gift, you will like da capo too. It's the same if you like Da Capo, the you will like gift as well .  read more 

Based on a visual novel by the same company (though Gift was produced under slightly different circumstances), both Gift and Da Capo share similar comedy/romance/harem themes, as well as the underlying ambiance of magic and fantasy, and how it can be used for good or bad. Both shows also cover the infamous "siblings but not REALLY siblings" relationship. 

if da capo used sakura tree, gift used rainbow. And the male protagonist acts like jun'ichi the female protagonist looks like kotori 

The art/animation style of Gift is similar to Da Capo. Circus also has a hand in the production of the visual novels of both titles and therefore the similarity. 

Both series are considered harem with the main protagonist dealing with the girls in her life in a school life setting mixed in with supernatural themes. Both series has elements of romance, drama, comedy, and some emotional moments as well that balances out the story.  

Both take place in a town where mysterious magical things happen, but for the first 8 episodes, it ignores the interesting premise and is just harem fluff. However, then things take a dark and dramatic term where the premise is actually used. Both also have overly jealous childhood friends.