Tatsuha is Eiri's brother, who has the same voice (though not the same seiyū) and characteristics as his older brother, but with black hair and eyes. Tatsuha is obsessed with Ryūichi and watches his Nittle Grasper video repetitively. He's quite the perverted and obsessive fan, not to mention a 16-year-old monk.

All Shuichi ever dreamed about was following in the footsteps of his pop idol, Ryuichi Sakuma and the band Nittle Grasper. Together with his best friend Hiro, Shuichi's formed a band called Bad Luck and they've even managed to get signed to a major recording label! Unfortunately, the studio deadlines are looming and Shuichi still hasn't finished the lyrics for any of the songs. What he needs is a little inspiration... but he's been running a little low in that department lately. While Hiro recommends finding a girlfriend, fate has other things in store for him... 
Walking through the park late one night, Shuichi's latest lyrics flutter away and land at the feet of a stunning stranger that takes his breath away. Unfortunately, that mysterious stranger happens to be the famous novelist Eiri Yuki, who completely crushes the young singer by telling him he has "zero talent". Now, Shuichi's so annoyed that he's managed to finish his song just so he can find and confront Yuki once again. But, are his actions really motivated by anger, or has he actually fallen in love? 
(Source: RightStuf)

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An American actor and voice actor who has worked on several animated TV series, and was the voice of SEGA mascot Sonic the Hedgehog, as well as Shadow the Hedgehog and Jet the Hawk, in the Sonic the Hedgehog video game series, where he is credited as Jason Griffith, before the role was passed to Roger Craig Smith. 

(Source: Wikipedia)

Bad Luck's lead singer and lyricist, Shuichi Shindo, is a total wreck. With deadlines for the band's next album looming, the pressure is on, but the normally energetic Shuichi has become listless and fallen into a writing slump. It's all because Yuki - the great love of his life - has suddenly become cold and distant. Depressed and anxious, Shuichi doesn't want to think about lyrics - he just wants to know how to get Yuki to talk to him! 
Now, thanks to Shuichi's big mouth bragging to the press about how talented he is, the band can't even hire someone else to write the lyrics for them. If they don't manage to break Shuichi out of his slump soon, it could mean the end of Bad Luck for good! 
(Source: RightStuf)

Shindou Shuichi is a young, energetic, and optimistic rockstar wannabe. He’s in a band with his best friend and is determined to top the charts. When a romance novelist named Eiri Yuki criticizes his lyrics, Shuichi takes it badly and wants to make Yuki eat his words…but as he starts to follow Yuki around, Shuichi falls hard for him. Yuki, despite his cold and prickly demeanor, even seems to like Shuichi back! Still, Yuki has a past full of trauma that he’s never fully faced, and Shuichi discovers that succeeding in the music biz might cost him his soul. Can these two very different men support each other and make this relationship work? (Source: Seven Seas Entertainment) Note: Includes 2 extra chapters.

A series of very graphic adult Gravitation doujinshi by the original mangaka:
 
Panda パンダ (Yuki uke, Seguchi x Yuki x Tatsuha) (2006) 
Kumagorou くまごろう (Shuichi x Yuki) (2006) 
Capybara カピバラ (Eiri x Shuichi / Hiro x Suguru ) (2007) 
Sakana 魚 (2013) 
Hyoko ひよこ (2013) 
Ushi 牛 (2013) 
Chirimenjako ちりめんじゃこ (2014) 
Torokeru Pudding とろけるプリン (2015) 
Ookami 狼 (2016) 
Kitsune キツネ (2017)

Remix 01: Shuichi x Eiri 
Remix 02: Ryuichi x Tatsuha 
Remix 03: Tatsuha + Yuki x Shuichi 
Remix 04: Hiro x Shuichi 
Remix 05: Tatsuha x Yuki 
Remix 06: Tatsuha x Ryuichi 
Remix 07: K x Hiro, Yuuzi x Hiro 
Remix 08: Yuki x Shuichi 
Remix 08.5: K x Ark 
Remix 09: Ma-kun x Taki 
Remix 10: Ma-kun x Taki x Ken 
Remix 11: K x Hiro 
Remix 12: Yuki x Shuichi

Tatsuha Uesugi