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!
but it was all just because 
I got lonely too easily.
لكن كان كلّ ذلك لأنّني سرعان 
ما شعرتُ بالوحدة
Und das nur, weil ich sonst
so alleine gewesen wäre.
pero solo fue
porque me sentía solo fácilmente.
ma in sostanza lo facevo 
perché mi sentivo molto solo.
mas tudo porque eu
não queria mais ficar sozinho.
Но ведь это всё потому,
что не хотел оставаться один.