One day, Kagura and the others notice that Catherine's eyebrows are on the verge of connecting. While the group is watching a report about an accident nearby where a truck fell over on its side, Catherine comes back and her eyebrows have connected. Catherine becomes violent for some reason and attacks Otose. When things settle down, Otose's eyebrows are also connected! Gintoki and the others run away from the strange incident. Then they notice that people with connected eyebrows are attacking people all over the place. Edo is placed under emergency alert, and people are forbidden from touching people with connected eyebrows. A great tragedy is descending upon Edo…
If you become infected, your eyebrows turn into a unibrow and you go berserk.
Si los infectan, sus cejas se convertirán 
en una sola y perderán el control.
Se você for infectado, suas sobrancelhas 
viram uma monocelha e você fica doido.