There are many blatant and obvious features in both anime series that make them increasingly similar to one another. For the most part, both are based off the mahou shoujou series and feature their magical powers. Although minor, both also have 5 people in the protagonist's group which makes comparison much easier between the two. Aiming for a goal, both groups' themes are based off friendship and their power extracted from them. The art style and music from both are equally beautiful and pretty though it may differ from time to time. Ultimately, Houkago no Pleiades and Mahou Shoujou Madoka Magica are similar in several factors that make them both enjoyable animes to watch. read more
Both series have similar aspects in both the story and the characters. As for the characters, they happen to be five friends who become magical girls and also uses the same variety of colors for the costumes. As for the story itself, in both series is approaching the end of the world, the enemies are controversial as to which side they really are and the protagonists become magical girls thanks to an alien. If you liked Houkago no Pleiades, you will like Madoka as it seems the most developed and dramatic version of a similar story.
-Centers around a group of middle school girls
-A kawaii E.T. comes to earth and helps bring the girls closer to each other
-Observatory is a key location
-Memory loss is a major theme
-Timeline shift/time travel
SnM is alot more overdramatic, while HnP has a more Mahou Shoujo feeling
- Both Anime's protagonist is a girl, and theirs appearances are both short-haired.
- Both Anime were "ET-related" story, except in Sora no Method the ET was "loli".
- Both Anime has one similar conflict, which is between the Protagonist and her best friend.
"Cute High Earth Defense Club LOVE!" / "Binan Koukou Chikyuu Bouei-bu LOVE!" and "Wish Upon the Pleiades" / "Houkago no Pleiades" are shows involving a cute alien creature giving five humans special abilities in order to achieve something.
The two series are both centred around a slice-of-life setting with an antagonist that is very obviously a friend of the protagonist.
Basically if you love animes where the protagonists do a lengthy transformation sequence every episode then these are for you. the premise is also very similar; they need to transform into magical girls/boys in order to help an alien.
only difference being one is with girls and one is with boys. Both also take place in a high school setting.
-Involvement of the main character wished for changing
-Granted wish and has the powers to transform into magical girls
-Involving magical girls, a group of friends finds out that they were also the chosen one and invited them to join them
-Both has a mission in order to fulfill, that's why they were granted the power
-Both involve lots of romance
-Both involve a very tight friendship and a lot of happiness
-Houkago no Pleiads is 13 episodes as for Shugo Chara is 3 seasons long
-Both are very happy yet sad animes at times, but Houkago is more deep and sad
-If you like one, you'd like the other
-Both very pure animes and recommended for all ages  read more
-Involving magical girls
-Girl finds a cute being that requests for help by capturing these certain stuff in order to have their wishes granted
-Girl is given magical powers and has friends who help too/ companions
-Of course, there are also enemies
-Is very pure as in nothing dark or perverted etc.
-Involves VERY cute romance
-Of course, both main characters are clutz/clumsy airheads
-Houkago no Pleiades is more sad, but if you like one, you'd love the other
-Both involve a friendship theme, but the ultimate moral is that you should follow your own dreams
-Pink-haired main character
-Blob-shaped alien characters
-Both are very beautiful stories that will make you cry
Both have a character who’s motivation is centered around reconnecting with a friend who seems to have forgotten her.
Both shows have several episodes that focus on supporting characters, as well as their emotional struggles and growth. Some characters from both series even parallel each other in terms of their story arc.
Both shows refuse to hold your hand when it comes to worldbuilding, and instead assume you know the trappings of the magical girl genre, which I personally find very refreshing.
Both shows comment on the underlying anxiety of the future, whether that’s losing your potential or moving on from past memories. There’s a lot of heartbreak involved when you realize that doors have closed for you, but you don’t feel as if you’ve grown whatsoever.
Both are GAINAX's productions about BISHOUJO, PARTNERSHIP, ROMANCE and SPACE.
Gunbuster - sci-fi, mecha, echhi
Houkago no Pleiades - magic, Maho Shoujo, moe
It seems that they are totally different types of anime, but both of them have a fantastic imagination for space and the theory of relativity. So in some ways, Houkago no Pleiades shows respect for Gunbuster.
Both anime are obvious of the Mahou Shoujo category. The characters of each are granted Magical Powers from an alien in order to collect items scattered about the earth from an accident to their spaceship. The main MC's of both shows are quite similar in the sense of being passionate about others and their self confidence in their abilities. They cross paths with an antagonist that also wants to collect the items for their own purpose. Instead of battling with them out of spite, they begin to understand their motive, gaining sympathy and compassion for them, and intend to save these individuals from their situation. Both series have a bit of quirkiness to them but also take their story-telling seriously in well expressed narrative and character depth. They also have a pretty good soundtrack and art work. Recommend watching both shows.
Main difference is Nanoha is more focused on it's intensity and seriousness of social issues and combat. Making it much more dramatic. Where as HnP takes a more subtle approach with the same type of issues and combat, plus it adds a focus on light romance. Bringing a bit of a lighthearted atmosphere.  read more
Space and time, multiple universes, fragments/pieces, memory-loss, magic, indirect romance, kawaiiness, GP-rated moeness, CGDCT, if plot elements like these are what you're looking for, then look no further with Houkago no Pleiades and Kobato.
Both of these anime has space and time concepts, as Houkago no Pleiades deals with multiverses in quite the same way as CLAMP's universe for Kobato-- space and time with magic, if I may add.
Much more, both of these seem to be looking for "fragments" that looks like sugar candies, with the former on engine fragments, and the latter on konpeito. Still not satisfied? Then both main characters also deal with a bit of memory losses and indirect romances, and they're also voiced by well-known seiyuus as well: Natsumi Takamori as Subaru, and Kana Hanazawa as Kobato.
Hence, with all the kawaiiness and moeness made, and to go with the same worry-free GP-rating, so you can let your imouto or son/daughter to watch these without getting a mindf*ck, Houkago no Pleiades and Kobato are what you earnestly be needing to watch. read more
"Stella Women's Academy, High School Division Class C³" / "Stella Jogakuin Koutou-ka C³-bu" and "Wish Upon the Pleiades" / "Houkago no Pleiades" are both slice-of-life series by Studio Gainax surrounding a group of young girls.
The protagonists of the two shows have in common of being the newcomer to the group.
-Both involve magical girls who transforms
-Both has a mission to complete (MewMew: Destory aliens, Houkago: Capture the fragments to help the aliens)
-Both involve having an enemy that's trying to get in their way of completing their mission
-Both involve school life, romance, comedy, happy
-MewMew is 52 episodes, and Houkago is 13 but both VERY good
-Houkago is more sad and mysterious than MewMew, but both very good animes. Like one, you'd definately love the other
-Main character enters into a new world that they never knew existed (Angel Beats: world of those who died and cannot rest peacefully and Houkago: the existence of alien, space, and magic)
-Meet irreplaceable/memorable friends and shows you their pasts, their wish, and why they ended up in the position where they are now
-Both involves having to do a mission/a purpose
-Both the animes romance are very similar to each other
-Basically, both animes are very similar, but Angel Beats is more dramatic and dark. As for Houkago, it's more happy, yet depressing. It's not as deep as Angel Beats, but both are very great.
-If you like Angel Beat's plot, then you will like Houkago, as long as you are okay with magical girls.
-Angel Beats = darker, PG13 , but Houkago no Pleiades is meant for all ages read more