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.
I used Warp Portal, which Vesta 
taught me, to visit Treyni-san.
استخدمتُ بوّابة التنقّل الآني مثلما
علّمني بيستا لزيارة تريني-سان
Durch ein Warpportal,
von dem mir Bester erzählt hatte,
Vesta me enseñó Warp Portal
y lo usé para visitar a Treyni.
Vesta me enseñó Warp Portal
y lo usé para visitar a Treyni.
Grâce à un portail créé
avec l’aide de Vester,
di sfruttare un portale di teletrasporto 
indicatomi da Vester
Usei o Warp Portal que Vesta
me ensinou para visitar a Treyni-san.
Через портал, о котором мне поведал Веста,
я отправился к Трейни.