Sora falls into bad company, and succumbs to the allure of some troubling habits. Despite Riku's continued attempts to save Sora from his poison vices, Sora remains steadfast, unwilling to abandon them. But Riku isn't prepared to give up without a fight.

Kaoru and Hikaru, the young Hitachiin twins, share a strong, unmatched bond of brotherly love. But Kaoru's feelings for his brother surpass the domain of fraternal affection and approach a desire for a relationship more romantic, physical, and forbidden.