Tensei shitara Slime Datta Ken OVA
English title: That Time I Got Reincarnated as a Slime OAD
Japanese title: 転生したらスライムだった件 OVA
Type: OVA
Episodes: 5
Source: Manga
Genres: Action, Comedy, Fantasy
Studios: 8bit
Duration: 23 min per ep
Rating: PG-13 - Teens 13 or older

One day, Shuna and Shion are fighting over Rimuru's squishy slime body as usual. Rimuru figures that giving them each a body double of himself would solve the conflict, but when he imagines some of his other friends asking him to do the same for them, he quickly drops that plan. Then he 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! What's more, Milim hears about his plan for a picnic and comes racing down from the sky!

(Source: Crunchyroll)