"Nearly every full-length play occupies five acts. The first corresponds to
jo, an auspicious and slow opening which introduces the audience to the characters and the plot. The next three acts correspond to
ha, speeding events up, culminating almost always in a great moment of drama or tragedy in the third act and possibly a battle in the second and/or fourth acts. The final act, corresponding to
kyu, is almost always short, providing a quick and satisfying conclusion. "
https://en.wikipedia.org/wiki/Kabuki