Spoiler free review!

Part 1: Introduction

Since the dawn of time incest was a very special genre, anime creators always used it's unique proprieties to bring forth artpieces that have peak comedic value (ex: kiss x sis), that puts you and kicks you out of your comfort zone by offering a huge contrast between excessive lewdness and purity (ex: Aki Sora) or they simply use incest as a basic premise for good tier hentai (ex: Swing Out Sisters), but almost none decided to take incest seriously. And I'm not trying to say that it is a bad genre, even if it lacks seriousness, incest is a very... interesting genre, but considering that Oedipal love is a real-world problem the anime industry really understates its weight. But fortunately for us, anime lovers, koi kaze came to change the long established situation and it does a pretty decent job at doing what close to none have done.

__Part 2: Why Koi Kaze is a good tier anime
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From all the shows that use inbreeding as a tool Koi Kaze is in my opinion the best option for newcomers because first of all it has a very serious down to earth aproach and also the incest is introduced very slowly in order to not stress out the viewer too much. Yes, we all inherently find incest disgusting, even I do, but even if you find it unbearably displeasing I think that Koi Kaze is sure worth giving a shot. Despite the fact that the anime has incest, it is actually a pretty well done 'forbidden love' story. Of course incest is not okay (and the couple understands that), especially considering that the age difference between the main characters is twelve years and the girl is only fifthteen, but can we really control who we fall in love with?, of course we can't and that's a big sad moment that's masterfully conveyed by Koi Kaze's creators. And yeah, it has some nice tier characters that back up the story and Kaname Chidori is quite a waifu tier lady. Other than that the anime has good looks accompanied by a lovely melancholic ost, creating an atmosphere that really sucks you in.

Part 3: Why Koi Kaze is not a god tier anime

With all its merits koi kaze is still far from being a masterpiece. First things first the main couple is kinda mid. Besides the fact that they are siblings and the fact that Koshiro is a pedo there isn't much interesting stuff going on between them. Compared to the majority of good couples in anime, Koshiro + Nanako lacks a good reason for their affection besides hormones and complexes which of course are realistic reasons but they don't work quite well in a story, plus i don't find their interactions entertaining or heart-warming enough. And the second problem is that the pacing might seem slow at times, that didn't bother me too much because those 'filler moments' aren't meaningless since they actually do a great job at building up the atmosphere but i totally see how someone could dislike the slower moments of the show.

Part 4: Conclusion

In conclusion I really hope that the next generation of Incest anime creators will take Koi Kaze as an example and create the ultimate incest anime that will improve on Kaze's shortcomings. Yes, Koi Kaze has it's flaws but it really does hit different.
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(i'm feeling a good 8/10 on this one)