Sickness

Sickness is a visual novel following Suoh, a high school student who becomes a violent criminal. After his parents die, he and his twin sister Sara move to another city using their savings. Sara continues attending her old school while Suoh works long, physically demanding hours; they survive on instant food and barely make ends meet. Suoh promises to provide for Sara, whatever it costs him.

Suoh's new life

After a violent altercation with his boss, Suoh blacks out and wakes beside the man's corpse. Rather than dwell on the killing, he worries about losing the income he needed. A coworker with criminal connections offers him an illegal way to earn money, one that rewards violence. Suoh proves well suited to crime and becomes a hired killer, taking jobs from his new boss while hiding his double life from Sara.

Suoh must contend with police, eyewitnesses and the hostility of other professional killers, as well as the threat of death on a regular basis. His story follows his attempts to survive and keep his promise to Sara, and raises the possibility of escaping crime or finding comfort elsewhere.

The people around Suoh

• Sara Tesla: Suoh's twin sister and a high school student. She presents herself to him as loving and angelic, but is narcissistic and two-faced with others and cares little for people outside her family. Her efforts to conceal this side of herself have led her family to mistakenly believe she is bipolar.
• Karasu: A rising crime lord whose businesses include gambling, corporate espionage and organ trafficking. He is known for providing “waste disposal” to neighboring towns, whether or not they ask. He hopes to build an empire to share with the unusual people he has taken under his wing and calls his “children.” Though many see him as a sadistic narcissist, he is described as a businessman who shows affection to only a chosen few.
• Sai: Karasu's most trusted employee, who oversees lucrative ventures from the shadows and trains new recruits, including Suoh. A ruthless killer who feels no remorse, he values his daughter's well-being and happiness above his work.
• Misa: Sai's teenage daughter, who wants a normal life. She has trained since childhood to protect herself and learned about her father's work. She uses her small stature and youth to become a discreet killer, but outside work is friendly once she warms to someone and protective of those close to her.

Visual novel content

The story contains 216,000 words, 85 CGs plus variations of several, 32 sprites, mostly for minor characters, and 31 original music tracks alongside 9 CCA-by tracks.