Masaharu Tsuwabaki ('Haru') had been living a more or less normal school life until, one day, he accidentally drinks a potion that transforms him into a tiny doll-like lamb at night. To lift this curse and return to normal, he must work with his "chosen girl" Sumomo Akihime, a very shy girl in his class. She is given powers by a magical ring, and together they must hunt down mystical artifacts called stardrops in order to return him to normal. At the same time, Tsuwabaki must keep his daytime identity a secret from Sumumo as well as keep their ability to use magic hidden. As he lives this double life, he grows closer and closer to Sumomo in both his human and sheep forms.
Kinomoto Sakura never imagined that by opening a book in her father's library, she'd be responsible for releasing wild magic into the world, yet that's exactly what she did. Too powerful to be let loose on the world, the magical Clow cards were sealed away long ago by their creator, Clow Reed. But all is not lost! For the guardian beast, Keroberos, was sealed along with the cards. Can Sakura, with the help of Keroberos, retrieve the cards before they wreak havoc on the town?
Both series are about little girl who gets magical powers to help in her quest to collect something back. Also, both girls have the help of a cute little animal.
Both series are about collecting magical items, Clow cards in Card Captor Sakura and stardrops in Nanatsuiro drops. Another similairity is the romance aspect. All though Sakura is younger then Sumomo, both feature the same cute and innocent first romance. And of course where would both series be without some rivals to meddle in it all!
Both anime have a lead female character with a magical mission thrust upon them. Ever willings as any main heroine would be, they take up the challenge. Having magical powers and collecting things and even having a little stuffed animal-like partner, you'd think one took the general concept from the other. Both are fun to watch and can leave you feeling very fluffy at times. If you like one, you very well should like the other.
Nanoha used to be a normal grade school student until one day she found a ferret in the woods -- but he's no ordinary ferret! His name is Yuuno, he hails from another world, and he needs Nanoha’s help to complete his mission: to capture the Jewel Seeds (mysterious stones that imbue their wielder with great power) that fell to Earth. Along with Yuuno, Nanoha must now collect the Seeds and protect her world, but she isn’t alone. A rival is also trying to collect the Seeds for an unknown purpose, and only Nanoha has the power to stop her…
Nanoha and Drops have much in common, so much that you can say Drops is a spinoff of Nanoha. They are both what I call 'New Magical Girl' series, in which there really is no prince or boyfriend as the main point and the lead girl has a transformed, former human as a companion. These series also have another magical girl that rivals the main hero and both are looking for the Seeds/Drops. I would also say that both are more aimed at a male audience than a female one.
The premise is similar: an ordinary girl gains magical powers and has to help a cute animal or stuffed toy by gathering Jewel Seeds in Nanoha's case, or star drops in Sumomo's case. They also have to deal with a rival later on. Both anime are really cute though Nanoha is more focused on action while Nanatsuiro is more romance-oriented.
In both, the main character finds a talking stuffed animal/ animal and takes it home. The main characters also has to collect stardrops/jewel seeds for their "pet."In both, there is someone else competing for collecting those seeds/drops.
Ink Nijihara, who does very well in her high school English class, has a crush on her classmate Nao; but as she is both shy and clumsy, she finds herself unable to get closer to him. Furthermore, since he does poorly in English, he does not intend to go to a university, crushing Ink's dreams of going there together with him. Out of the blue, a talking duck who turns out to be a polymorphed (and perverted) wizard exiled from a magic kingdom falls from the sky and lands in front of Ink. He offers her magical powers in return for helping people in need. Ink sees the magical girl transformation as a chance to help Nao with his English without feeling embarrassed about it, and thus she begins her adventures as Magical Teacher Pastel Ink!
Moetan and Nanatsuiro Drops are both magical girl series that sort of make fun of the mahou shoujo genre; they also have the same premise of a mascot that is not in his original form. You'll definitely see typical magical girl elements such as transformation, costumes, and devices (ex. wands). Nanatsuiro Drops is much more colourful and sparkly while Moetan has some (perverted) humour.
Both are obviously mahou shoujo series complete with transformation scenes, small animal mascots and so forth. If you like either of these shows, it's likely at least partially due to the romantic sub-plots; if that is the case, if you liked one, odds are you'd like the other. Both shows should also appeal to those who have a taste for underage girls-- Moetan has plentiful loli fanservice, and Drops is based on an H-game and thus also has its share of loli cuteness.
The cheery Kobato Hanato is on a mission to heal people’s damaged hearts and gather the resulting “konpeito”; she must collect one hundred of these candy-shaped trophies in order for her deepest wish to be granted: to go to a certain place. Along the way, she’s accompanied by an ever-disgruntled, talking stuffed animal of a guardian named Ioryogi who scores her efforts, attempts to keep her on-track, and reminds her of the rules governing her task: she only has one year to fulfill her goal and she must not, under any circumstance, fall in love with someone whose heart she heals.
Both anime have cute characters and the plot is similar: To collect something (candy in Kobato. and stardrops in Nanatsuiro Drops) to achieve a certain goal. Both anime also have talking plush toys to guide the heroine. In both anime, the heroine faces many obstacles and falls in love with someone. The ending is also somewhat similar. If you loved Nanatsuiro Drops for its cuteness, Kobato. probably has more humor and funny moments that I can think of in Nanatsuiro Drops. So if you like one, you may very well like the other.