About Doseverse: The majority of people are Normal; special races like Drugs and Krankes are rare.

Drugs are individuals who can cure any illness, while Krankes are born sickly and can only be cured through contact with a Drug. Drugs are revered, while Krankes are despised and pitied. Because Drugs are rare, medical science and medicine have developed to a certain extent, but Drugs are relied upon for incurable diseases. Consequently, Drugs are highly prized. Krankes are socially shunned because they can only be treated through contact or bonding with a Drug.

Drugs: They can heal someone just by being near them if they are unwell. They themselves do not get sick. They are not affected by long-term contact with other Drugs. While there are individual differences, they are generally born with a nurturing and caring disposition.

Krankes: Born with weak bodies, they frequently suffer from unexplained poor health. Their condition improves through contact with a Drug. They can be cured by bonding with a Drug, but if the Drug dies or the bond is broken, they fall ill again. General medicine can stabilize their symptoms, but a fundamental cure is impossible. A Krankes' illness is not contagious to Normals or Drugs.

Normals: Ordinary people. When they get sick, they can generally be treated with medicine. If they come into contact with a Drug, they heal much faster than with medication. If they contract an incurable disease, they must be cured by a Drug, just like a Krankes. However, prolonged contact (over 30 minutes) with a Drug leads to an overdose state, causing various symptoms (vomiting, dizziness, confusion). Staying together for a long period (over 3 days) leads to addiction, and they suffer withdrawal when separated.

Incidentally, if a child is born as a Drug, they have a built-in resistance and will not fall ill even if they stay together for a long time. (In exchange, they cannot be healed by others when they are unwell.)