Late-Start Tamer's Laid-Back Life (Manga): Volume 8

As Yuto and his monsters make their way out of the Water Elementals’ Trial, a surprise unique monster shows up to thwart their escape. However, this threatening foe turns out to be a new lovable companion. Yuto’s experience at the Water Elemental Gate then gives him an idea about the secret behind unlocking the other Elemental Gates. And as his list of discoveries grows, his monsters also go through exciting new changes!