Voice actor Shunsuke Takeuchi is joining the cast of the ongoing I Left My A-Rank Party to Help My Former Students Reach the Dungeon Depths! TV anime series. The anime began airing in Japan on January 12, 2025, with the second part debuting on March 22, 2025. It is expected to run for 24 total episodes.
Takeuchi will voice Mastoma, who is a ruler of a distant land that is trying to marry Rain. The character appeared in a brief cameo in the 14th episode.

He joins the anime’s main voice cast that includes:
- • Hiromu Mineta as Yuke
- • Hana Inami as Marina
- • Natsumi Kawaida as Silk
- • Nene Hieda as Rain
- • Maria Sashide as Nene
- • Yuki Tanaka as Niberune
- • Kazuhiko Inoue as Loge
- • Kimiko Saito as Maniella
Katsumi Ono (Hypnosimic –Division Rap Battle– Rhyme Anima, Symphogear) is directing the anime, with Kazuyuki Fudeyasu (Shangri-la Frontier) as series screenwriter and scriptwriter, Masakazu Yamazaki (Birdie Wing -Golf Girls’ Story- co-sub character designer) as character designer and co-chief animation director, and Akira Kikuchi (Birdie Wing -Golf Girls’ Story-) as action animation director. BN Pictures is handling the animation production.
The anime is based on the light novel series written by Kosuke Unagi and illustrated by Super Zombie. It was first published by Kodansha under its K Ranobe Books label on June 2, 2021 and concluded on February 28, 2025. A total of five volumes were released during its publication.
The series began as a Shosetsuka ni Naro web novel from October 2, 2020 to August 26, 2023. A manga adaptation by Yuri was launched in June 2021. Kodansha USA releases the manga in English digitally for North America.

Crunchyroll is streaming I Left my A-Rank Party to Help My Former Students Reach the Dungeon Depths!, which describes the main synopsis as:
Yuke, a red mage, angrily declares that he’s leaving Thunder Pike, the A-rank party he’s been with for five years, because he’s fed up with being insulted and ridiculed by the other members.
While searching for a new party, he runs into his former students Marina, Silk, and Rain, and decides to join their party, Clover. Encouraged by their admiration of him as their teacher, Yuke leads them in completing several quests that show off his own extraordinary magic and skills while bringing out the girls’ abilities to their fullest.
Then, through an “adventure broadcast” by an artifact known as Camelot, Clover becomes well-known throughout society. The party’s dream is to conquer Achromatic Darkness, the most challenging dungeon of all, but as they take on other dungeons in hopes of eventually achieving that goal, they gradually become entangled in chaos that threatens the whole world…
Source: I Left My A-Rank Party Official Twitter, Comic Natalie