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DAMN YOU WIKI.
Fine, you are right. Though not the wiki convinced me...mostly, but the fact thet is its indeed rather typical in sibling relationships. Though since Shuuki and his brother in question can end up together, I still think there is at least a steak of tsundere trait Shuuki has there. Granted, maybe it's more kuudere, as the deredere-part of him is minimal and in fact only is seen in his "denying that he cares for the sibling even though he does" and I guess being more of a deadpan snarker makes him an detached, distanced person more than a tsuntsun person. Or just someone who is very prone to frowning and snarking.
To me, someone is tsundere or has tsundere traits if he acts obnoxious or something and actually cares for that person, just would never ever admit it out aloud. ...and I stop now before I end up sprouting more nonsense because I can't take being wrong. I know I am a horrible person 8D
I really should be careful with these character archetypes...
(Well, that's probably because it's either you like Starry Sky or hate it - and the game reviewers were certainly not kind to the plot, that is indeed somewhat boring, and characters, especially Iku. ...but seriously? HOW CUTE *A* But it doesn't change the fact that the anime did portray him as ...well, wannabe-playboy and personal-space-invading guy just to freak out the female. And Gemini character traits are 'cunning, 'witty'' and superficial' amongst others.
I still love him, though. Cancer is worse, though, changeable and moody, overemotional and touchy, clinging and unable to let go...o_O
...well. Reviewers say if it was a R18 game, Iku might be the residential yandere rapist, so. Starry Sky has four yandere; Suzuya, Homare, Iku and Hayato, and somehow because of Iku's apparent manwhoring people exaggerate and see him as potential rapist the most out of the four. Well, and teh palyboy idea comes naturally, what with iku 'playing around' because he says love is a game he won't lose blablabla xD
Okay, enough off-topicness xD)
And yes, the title rings a bell. Some Little Red Riding Hood esque H-otome game, I think....
*pending signature, as in, I don't have any if this signature doesn't allow any 100px high images TAT*