17-year-old Siki Tono returns to his home after 8-year absence. Once this decision was made by his father - a hard and inflexible head Tono ancient family, and canceled the expulsion of his sister Akiha, who after his father`s death the new leader of the clan. Although Shiki,who grew up in the care of my uncle and aunt - bland and sickly young man, accustomed to the quiet life, even he is surprised by the strict order imposed by a sister that are more suitable siege than influential family mansion.But the newly found understanding with old childhood friends - the maids Hisui and Kohaku - Siki helps overcome curfews and enjoy modest pleasures of a normal Japanese guy. That`s just normal right? whether it is normal, his sister, the family, the surrounding? Whether the normal world, lined with strange lines whose crosshairs - it hostsdissolve the very fabric of reality? And why should unthinkable beautiful girl in the park greeted, asked: "Why did you kill me yesterday?" Eroge Tsukihime by Type-Moon Company.