Acquired Immunity (Manga)

Memory Cell had a flashback of Mumps virus entering the body through vaccination, and being recorded by the past Memory Cell and thought it was a vision of the future. Not long after, the real Mumps virus invasion is happening. As he struggles with his PTSD, the B Cell is helping him to calm down as the body is overwhelmed. Turns out that they already got intel about those virus, thus, Mumps virus crisis is averted with the power of Acquired Immunity.