My Bodily Fluid Immunity

When I turned eighteen, the world started getting strange.

My soft and sweet childhood friend, a bunny of a girl, was the boss of the mafia, while Lord Hibari, the great guardian of Namimori, was her subordinate?!

The company I joined, which occupied one of Yokohama's five standard skyscrapers, turned out to be a den of criminals, and I finally became one of those run-of-the-mill mafia members myself?!

A sunny or sadistic boy with a split personality, who stubbornly denied it, bit my neck and laughed that the brat could no longer stop him from destroying humanity?!

What? Could I go back to my birthday? I want to wish for a normal world. If I have to make a huge sacrifice in exchange, then take every last strand of my big brother's hair. He's a genius at everything anyway.

Bug and OOC warnings. Lots of headcanons, almost no plot.

Humoral immunity is an immune mechanism in which plasma cells produce antibodies to protect the body. B cells are responsible for humoral immunity.

Body fluids: The body contains a large amount of water. This water, together with the substances dispersed in it, is collectively known as body fluids, making up about 60% of body weight. Body fluids are divided into two parts: intracellular fluid, found inside cells and accounting for about two-thirds of the total, or about 40% of body weight; and extracellular fluid, found outside cells and accounting for about one-third.

Extracellular fluid is further divided into two types: tissue fluid, found between tissue cells and including lymph and cerebrospinal fluid, accounting for about 16% of body weight; and blood plasma, accounting for about 5% of body weight.

The above information is from Baidu Baike.

Body fluids are about as innocent as you can get.

Saliva, sweat, and even tears don't count as body fluids (probably).

Theme: A strange world with a normal vibe.