One day, when Shuna and Shion are fighting over Rimuru's squishy slime body as usual, Rimuru comes up with the idea to make a cushion in the shape of his slime form. He travels around Tempest to see if his friends know of any good materials he can use, and he learns that a special type of sand found along a lake shore in the forest is exactly what he's looking for. So he sets out to collect some sand... but a monster is waiting for him by the lake!
Even if I'm busy, I'd drop everything 
to be with my bestie when they ask!
ولو كنتُ مشغولة، سأترك كلّ شيء لأبقى
!مع صديقي العزيز متى طلب ذلك
Aber man kommt doch immer, wenn der besteste
Freund einlädt. Egal wie beschäftigt man ist.
Aunque lo esté, lo dejaría todo
por mi amigui si me lo pide.
Aunque lo estuviera, lo dejaría
todo por mi amigui.
Quand bien même, je réponds présente
si c’est mon super pote !
Anche se sono impegnata, se l'invito viene 
dal mio amico del cuore ha la precedenza!
Mesmo ocupada, eu viria correndo
ao convite de um superamigo!
Пусть и занята,
к другу лучшему сразу бы сорвалась!