Now that the first session with the mental imprint had ended, he immediately shifted to the next step of the training. Which was ensuring that his body learned to accept the virus without making too much of a fuss, the kind of fuss that the human body normally made when it was infected by a virus.
He had already begun to experience it now that the virus was injected in his body. What he needed to do was make sure that his body did not kill the virus through its immune system. The Squire evolution process evolved all of the aspects of the body, including the immune system of the Martial Body.
What Rui needed to was make sure that the body adapted to the presence of the virus instead of fighting back.
Unfortunately, this would take quite some time. Until then, he was going to suffer. The biggest issue was getting the body to normalize the virus in it. Fortunately, such a thing was not unheard of.