i don’t understand what’s the deal with the manga and novel, it’s a ikuhara thing? he likes to have all of these stuff releasing almost at the same time as the anime? what I care is, what’s the original source?
Yes. It’s an Ikuhara thing, but also just marketing. The Sarazanmai manga is a spin-off story so it acts as support for the anime and fleshes out the characters more. That is, as long as it’s actually related to the anime and not an AU story. We don’t really know it yet.
The novel is written by Ikuhara and Utsumi, the same people who are writing the anime scripts. So far it’s been the same, but with some extra narration and some scenes have been shuffled around. It doesn’t matter to them that it spoils (half) the story. The fun is watching the events unfold and to see how they’re depicted in the anime. The novel might even make things easier to follow and understand, since Ikuhara anime can be quite cryptic.
To answer your question of what’s the original source, Sarazanmai has always been marketed as Ikuhara’s new original anime. The novel got made to give them more publicity. It’s also a fairly easy way for them to earn more money, since it’s expensive to make anime and Ikuhara’s series usually don’t sell that many BD’s and DVD’s.
From what I remember Yuri Kuma Arashi’s manga was completely differently from the anime. That could be the case for the Sarazanami manga too.
To expand on this, Yurikuma Arashi’s manga was developed at the same time as the anime, by the same people (story by Ikunigomakinako, art by Akiko Morishima, who did the character designs for the series). Its serialization began one year before the anime started airing and ended one year after it finished, producing 3 volumes total. The characters are the same, but they’re slightly different and the story’s completely different with some common elements and themes.
There are also 2 Yurikuma Arashi novels written by Ikuhara, Takayo Ikami, and Kei Takahashi. The first volume was released a few weeks after the first episode came out and the second volume was released at the same time the last episode aired. Unfortunately I don’t know anything about these novels, but I’m willing to bet that they’re almost identical to the anime.
Penguindrum got 3 novels, written by Ikuhara and Kei Takahashi. The first one came out a few days before the first episode aired. It’s almost exactly the same as the anime, just like the Sarazanmai novel. Two years later Penguindrum also got a manga adaptation consisting of 4 volumes total. I only have the 1st volume, but it’s pretty much exactly the same as the anime.
Utena was another project where the anime and the manga were developed at the same time. The creators all worked closely together and took inspiration and ideas off each other. The manga and anime shares the same characters and story elements, but tell different stories. Utena also has a novel adaptation. It was released after the anime tv-series and is loosely based on the first episodes, but very loosely at that. It focuses on different characters and has changed a lot of details.
What we’ve learned from all this is that novel adaptations that are almost perfect copies of the anime script and that get published alongside the anime are common for Ikuhara. What’s new is the spin-off manga. Utena and Yurikuma Arashi’s manga were clearly meant to be another take on the same story, whereas Reo to Mabu: Futari wa Sarazanmai gives us a story that we can expect to tie in with the anime, since the focus is on two side characters and not the main cast, it ends by teasing a mystery and it’s clearly set years before the anime.