If you liked
Onegai☆Twins
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...then you might like
Koi Kaze
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Both are WOEFULLY and CRIMINALLY underrated GEMS that deal with siblings who live together after not knowing each other for over a decade. Masterful and realistic romance anime that share the sibling sub genre. Main difference is the male MC, where Koi Kaze has a very realistic and flawed lead Koshiro, and Onegai Twins has a stellar and truly beautiful lead in Maiku that all other romance/harem anime male leads should envy. Both are MUST WATCH worthy, and are leaps and bounds better than their low 7 ratings and are actually some of the BEST anime for their genre ever created.
If you liked
Ginga Eiyuu Densetsu
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...then you might like
Code Geass: Hangyaku no Lelouch
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LOGH is the Mature and Sophisticated version of CG. It's the evolution from a kid still Potty Training, to being the Engineer that built the Zero-Gravity Space Toilet. It's the leap from being a Pee Wee League Basketball kid, to being the next Michael Jordan. It's the upgrade from Atari 2600 to the Playstation 4 or Xbox One. It's the difference in illumination between a Candle and the Sun. It's the transition from an Appetizer to the Main Course- and that is the main merit of watching CG, as to prepare you for the Real Deal. When one has seen enough of the "Staples" and "Popular" Anime, and are looking for the Next Level, they turn to the True Elite Logh. Until that point they can not be considered a True Anime Fan.
If you liked
Dragon Ball Z
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...then you might like
Ginga Eiyuu Densetsu
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The True Elite of their respective genre's. DBZ is the King of Shounen Battle Anime, with an Unsurpassable Power Level, while LOGH is the Unrivaled Poem of Space Battles, Political Power Struggles, and Philosophical Battle of Ideal Government Systems. They share Dozens of the same Seiyuu for both series, most notably Horikawa Ryo as Vegeta and Reinhard, and Wakamoto Norio as Reuenthal and Cell. The main characters are quite similar, with Yang and Goku both being the last hope and viewed by their friends as the Eiyuu/Heroes to save them from dire straits. Vegeta and Reinhard share not only the same voice, but both are Princes that demand their rightful place and want to seize the universe. They both share an Eternal Rival that they fear, respect, and ultimately want to subjugate, in Yang and Goku, who are relentlessly in their way. Julian and Gohan are similar in that both of them have the obligation to take over when their respective fathers can't be there, even though they fall short of the Legends that have to try to match up to. Both are from the late 80's into the 90's, so their Animation is old, but the strongest Gems and Staples in Anime are from these decades.
If you liked
Koi Kaze
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...then you might like
NHK ni Youkoso!
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The old school art and serious vibe immediately link the two Masterpieces. Both main characters, Satou and Koshiro share similar habits and inner turmoil. This ranges from smoking, badgered clothing and unkempt/unshaven appearance, and accumulating garbage and tissues around their residence, as well as the psychological ramifications of their predicament and the societal acceptance, or lack thereof. Both share comparable female's in Misaki and Nanoko, who are fairly younger and intrude in the MC's life as love interests out of the blue, but with a predetermined goal in mind. Both MC have reservations from pursuing their love interests, albeit for different reasons, yet both divulge into guilty fantasising and getting off in misery to the tempational vixens, which they know are beyond their reach. Both MC share an Older Acquaintance , Hitomi "Senpai" and Chidori respectively, who get in the way of their love interest. All these characters dance around the edges of committing suicide, and in nearly identical settings to boot. There are endless similarities between the 2 Giants, and if you liked one you WILL like the other.
If you liked
Koi Kaze
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...then you might like
Ore no Imouto ga Konnani Kawaii Wake ga Nai. Specials
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Koi Kaze is like the Intellectual and Elite version of Ore no Imouto, which it certainly influenced. However Chidori is a vastly superior version of Manami, and in Koi Kaze the main characters actually have guts to stand by their feelings even without having a firm plan to solve the inevitable problems. The realistic and dramatic portrayal is much in line with reality, as opposed to the Harem Esque and more mainstream OreImo. While Koi isn't as pleasing as OreImo visually (unless you are fond of the Unparalleled NHK), it tackles the Elephant in the room exponentially better.
If you liked
Abashiri Ikka
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...then you might like
Yuu☆Yuu☆Hakusho
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Not as bad as most people think. It immediately brings to mind Yu Yu Hakusho, due to having some of the same Voice Actors. The eldest brother Abashiri, Goemon is voiced by Chiba, Shigeru, or Kuwabara from YYH(Also does Buggy from One Piece). The main love interest, Shirane, Yukiko, is voiced by Amano, Yuri who does Yusuke's love interest from YYH Yukimura, Keiko. The main Abashiri character Kikunosuke, is highly reminiscent of a female version of Yusuke, in terms of a similar physical appearance, as well as similar power level and fighting style.