Rimuru becomes the new teacher for Shizu's students. However, having been summoned into this world against their will and facing shortened lifespans as a result, the children's feelings are complicated, and they're reluctant to accept Rimuru. So Rimuru proposes a series of mock battles with each of them to ascertain their abilities and allow them to let off steam.
Flow of water, ensnare my enemy.
يا تدفّق الماء، أوقِع عدوّي
O großer Strom, ergreife meine Feinde.
Flujo de agua, atrapa a mi enemigo.
Flujo de agua, atrae a mi enemigo.
Eaux vives, entravez mon ennemi…
Corso d'acqua che scorri imperterrito,
Fluxo de água, prenda meu inimigo.
О могучий поток воды,
опутай врага моего!