[[caption-width-right:311:Sumomo and Yuki-chan]]

->''"This is something that happened in the town closest to the first star of the night. The important story of the two of them. Where should I begin?"''

Masaharu "Haru" Tsuwabuki is an introverted {{highschool}} student. After going about things as usual he bumps into a masked figure and accidentally picks up a dropped potion of theirs, later drinking it thinking it to be soda. He then finds himself transformed into a lamb, and must collect seven stardrops to return to normal.

''Nanatsuiro Drops'' is a VisualNovel developed by UNISONSHIFT and released on April 21, 2006. First available on the PC, the game contained adult-only content. It was later ported to the UsefulNotes/PlayStation2 by Media Works and released [[AscendedExtra with additional characters]] but [[BleachedUnderpants without the adult content]] on September 20, 2007 under the title ''Nanatsuiro Drops Pure!!''. A similarly censored version for the Nintendo DS was released on May 15, 2008.

Shortly after a LightNovel was adapted from the work written by Tamaki Ichikawa and illustrated by Noizi Ito, published by Enterbrain on June 30th 2006.

This was quickly followed with a {{Seinen}} {{Manga}} adaptation created directly under UNISONSHIFT and illustrated by Yūki Takami first published by Media Works in September 30th in Dengeki G's Magazine with an ongoing run, currently totaling three volumes. A second Shōnen {{Manga}} adaptation also produced under UNISONSHIFT was made under the title ''Nanatsuiro Drops Pure!!'' illustrated by Sorahiko Mizusima and again published by Media Works this time in Dengeki Comic Gao!, running from April 27, 2007 ? February 27, 2008, culminating in one volume.

Finally, a [[TwelveEpisodeAnime twelve episode TV Anime]] was produced by Studio Barcelona under director Takashi Yamamoto with an original run between July 2, 2007 ? September 30, 2007. The opening theme is "Shining stars bless☆" by Kaori Utatsuki, and the ending theme is "Mo・o!" by Loverin Tamburin

An Internet radio show called Nanatsuiro Radio! was also based on the work, starting on April 6, 2007, and published by Media Works.
!!The anime provides examples of:

* BeachEpisode: Episode 4.
* BlushSticker: These seem to be an actual part of Yuki-chan's face.
* ChromaticArrangement: Sumomo(pink), Nako-chan(green), and Nona(blue).
* CurtainsMatchTheWindow: Pretty much everyone besides Flora and Prima Asparas, both being blue-eyed blondes.
* FirstGirlWins: Sumomo is the first girl we see. She and Haru end up together.
* FirstKiss: [[spoiler: Sumomo and Haru]] have theirs in episode 8.
* GottaCatchEmAll: Whoever gets 7 Stardrops first wins.
* HugeGuyTinyGirl: Haru is very tall, while Sumomo is very short.
* IdiosyncraticEpisodeNaming: Every episode name has the word "color" somewhere in it.
* {{Kimodameshi}}: In episode 5.
* LargeHam: Arthur Matsuda.
* LaserGuidedAmnesia: [[spoiler: The price of giving Haru the potion that makes it so he won't turn into Yuki-chan again is that he won't have any memory of the past six months. Meaning pretty much everything from just before the start of episode 1.]]
* LuminescentBlush
* {{Lunacy}}: On a new moon, Haru will stay human for the whole day. On a full moon, Haru will remain as Yuki-chan for the whole day.
* MacGuffin: The Stardrops.
* MagicalGirl
* MeetCute[=/=]CrashIntoHello: Sumomo and Haru. They bump into each other and Sumomo drops her watering can, which gets Haru all wet. Sumomo starts crying, and Nadeshiko runs over, sees Sumomo crying, and pretty much threatens to kill Haru.
* {{Meganekko}}: Nona Yuuki. She only needs them in civilian form, apparently.
* MissingMom: Sumomo's mom is apparently working overseas, or something.
* NerdGlasses: Haru's friend Keisuke.
* OfficialCouple: Haru/Sumomo.
** [[spoiler:IWantMyBelovedToBeHappy: If Sumomo wasn't chosen in the game.]]
* TheOjou: Nona.
* OnlyKnownByTheirNickname: Nako-chan's full name is Nadeshiko Yaeno. Anyone who doesn't call her 'Nako' calls her 'Yaeno'.
* PunnyName: In Japanese 'Yuuki Nona' can be written as ''organic vegetables''.
* RapunzelHair: Nona and, to a lesser extent, Nako-chan
* TheRival: Nona Yuuki.
* SecretKeeper: Nadeshiko.
* ShipperOnDeck: Pretty much everyone in regards to Haru/Sumomo.
* ShrinkingViolet: Sumomo.
* SuperDeformed
* TransformationSequence: An odd case in that they wait until the ninth episode to give her one, and then we see it exactly twice.
* TwelveEpisodeAnime
* YouGottaHaveBlueHair: Sumomo(pink), Nako-chan(green), Nona(blue), and Nobuko(literal red).
-->''"For example, when looking at the stars outside the window. For example, when writing in the secret journal about the day. Mysterious things suddenly fall down from the sky. The key to everything are the Stardrops that fall from the sky, and a special girl. It is a magical story of 'a seven-colored first love that encompasses you.'"''