Lead Voice Actress Miho Okasaki Talks About Recording Episodes for "That Time I Got Reincarnated as a Slime the Movie: Tears of the Azure Sea"

The TV anime "That Time I Got Reincarnated as a Slime," whose first season aired in October 2018, has been confirmed to broadcast its fourth season in five split cours starting in April 2026. It continues to develop as an immensely popular series. The second theatrical film, "That Time I Got Reincarnated as a Slime the Movie: Tears of the Azure Sea," opens on February 27th, and it's also generating buzz that Koichi Domoto will be voicing the original character Zodon.

In this article, we conducted an interview with voice actress Miho Okasaki, who has been voicing the protagonist Rimuru Tempest since the series began. We bring you her thoughts on the recording sessions for "That Time I Got Reincarnated as a Slime the Movie: Tears of the Azure Sea" and her feelings about continuing to play Rimuru for approximately eight years.

——Please tell us about the recording sessions for this film. We heard you recorded together with Saori Ōnishi, who plays Yura.

Okasaki: Saori-san is also a senior at my agency, but despite joining a recording session where the cast has already developed a family-like atmosphere through years of working together on "TenSura," she came in very casually and friendly. In fact, Tomari-san (Asuna), who plays Gobta, seemed more nervous (lol).

——The story you shared during the Season 4 major announcement livestream at the end of 2025 was memorable—about how Tomari-san was so nervous that she remained standing throughout the recording breaks (lol).

Okasaki: Exactly, and that contrast was really funny (lol). The balance and chemistry between the two of them is wonderful, I think. Recording sessions are a mysterious thing—for example, if Rimuru, the character I'm playing, is steady and grounded, I also borrow strength from Rimuru and feel like "Let's stay calm and do this!"

I think it wasn't so much about Tomari-san herself, but rather the tension arose from the gap between the Gobta role she's built up until now and the Gobta role in this theatrical film, which has a slightly different flavor.

——As you said, Gobta in this film isn't the comedic relief, but plays an active role that could be called a secondary protagonist.

Okasaki: The aspects that become visible through the story are completely different, and I think it was significant that we ourselves discovered through this original story that Gobta had such dimensions to his character.

——Because you've been playing the role continuously in an anime series that's continued since 2018, you can now see value in aspects that differ from before.

Okasaki: As an actor, I'm asked to deliver parts that aren't usually required, and I also felt it was natural for my mindset to change accordingly.