They both have multiple heroines with a male protagonist as the main character at the center of everything. Each heroine has a unique past later found out through the anime. However, "Rewrite" has a supernatural theme to it unlike the series of "Grisaia".
Clannad and Rewrite were both written by Key and had similar male main characters, the story unfolds around the interaction of the MC with the the girls around him while he becomes closer to them. These two series have a similar art and story lines, filled with romance, comedy and drama.
Both are adapted from Visual Novels by Key. Both feature a hero in a school setting surrounded by cute girls, each with their own story, and both feature subtle elements of fantasy and supernatural, mixed with tragedy.
Also, MintJam does the theme music in both.
The stories consists of seemingly normal worlds with a group of great friends that are having the typical school life. It's pretty simple to believe that they're slice of lives without stories. However, nothing is as simple as it sounds because there's a major truth that exists in both worlds. Both of the main characters wanted to pry too deep into the surrealism because of their curiosity. The thing that they didn't realize is how everything, including their friendship would shatter because of their simple greediness to know. Both of these shows are from the KEY studio which means that they will be very dramatic and the development will mostly go towards the characters. The key elements in this anime are the perfectly done character drama and friendship aspect which does mean that the story will be flawed. If you can connect with the characters these flaws can easily be overlooked. read more
Kyoukai no Janata is similar to rewrite as both the main male protagonist have the same nature Akihito Kanbara and kotorou tennouji have free nature but still they have some super power which they try to hide not only that they both have blond hair color .(:
Both are about highschool students with superhuman abilities. Both also has similar artwork since they are both made by key. As you guys already know, key makes mostly emotional animes so i am sure you guys can be hyped to get ready for the feels (sadness, happiness? Anything... i wont spoil) I m sure you guys will like this anime even if they have different plots. They are similar in one way or another.
Both anime series revolve around the story of students who posses supernatural powers and mix it with a touch of romance. The approach to both aspects is really similar and watching Sakurada Reset (first 2 episodes or so) reminded me of Rewrite.
Both anime deal with environmental themes; the main characters are confronted with difficult questions which doesn't only involve those dear to them; but the fate of all of mankind. Rewrite has a male main character with a harem of 6 females, and has more comedy than Arjuna, which mainly revolves around one female character.
Both are VN adaptations from Key/Visual Art's. Both series shows on how our world can be destroyed by humanity. Both have a male protagonist with atleast 1 main female heroine. Both are drama stories, but Rewrite is more focused on world building/development, while Planetarian is focused on the character's interactions.
Rewrite and Shoushin Shoujo Matoi share some similar characters and similar atmosphere/feel to the show. In each there are supernatural things that mesh into society. There are also several organizational groups in each show that all seem to be after one goal. Each of these shows throw a lot of information at you at once and they also try be comical. Shoushin Shoujo Matoi involves magical girls and rewrite has much more supernatural plot twists in each character. If you enjoyed one I would recommend the other.