[2026] Summary of Opening, Ending, and Insert Songs from That Time I Got Reincarnated as a Slime

To You Within MeTRUE

To You Within Me

This is a ballad that feels like an inner dialogue, where emotions gradually expand from a quiet opening.

Just by listening, you can picture the inner strength of living on while carrying someone’s feelings.

Even amid a sorrowful parting, it seems to kindle a steady hope to move forward.

This song was used as an insert song in episode 23 of the first season of the anime That Time I Got Reincarnated as a Slime.

TRUE wrote the lyrics and performed the vocals, and it was included on the album That Time I Got Reincarnated as Music, released in March 2019.

It was later featured on the album Kotoba Asobi as well.

With supple yet powerful vocals that closely follow the heart of the story, this piece is for anyone who wants a gentle push forward while holding on to precious memories.

Good fireworksYoihanabi · Rimuru (CV.Okasaki Miho)

Good fireworks

A lively, fun Japanese-style pop song that makes your body sway all on its own! This track was featured as an insert song in the spin-off anime “The Slime Diaries: That Time I Got Reincarnated as a Slime.” Miho Okasaki, the voice actress for the protagonist Rimuru, delivers a superb performance under the character’s name.

With imagery that vividly conveys the festival atmosphere—like food stalls and Bon Odori dances—and a catchy, familiar melody line that sticks in your head, it really stands out.

Included on the soundtrack album “The Slime Diaries Original Soundtrack,” released in June 2021, this piece uniquely captures the series’ peaceful, conflict-free storyline.

Give it a listen when you want to lift your spirits together with friends!

That Which Goes AroundTerashima Takuma

Takuma Terashima / “Megurumono” Music Clip (“That Time I Got Reincarnated as a Slime” OP Part2)

Stories of mysterious encounters and growth in another world capture everyone’s heart, don’t they? This song was chosen as the opening theme for the second cour of season 1 of the anime “That Time I Got Reincarnated as a Slime.” Takuma Terashima, who is also active as a voice actor, wrote the lyrics himself, and the track was released in February 2019 as his ninth single.

It features a distinctive rock sound that combines grandeur with forward momentum, showcasing the full extent of the expressive power he has built up over the years.

The lyrics, which depict shifting scenery and the bonds of fate, convey a deep affection for the work.

It was later included on the album “ASSEMBLE.” This fiery anisong is perfect for diving into a new environment or for anyone who wants to lift their spirits.

Little SoldierAzusa Tadokoro

Azusa Tadokoro / Little Soldier -Music Video-

This rock tune portrays the unbreakable will of a small warrior who keeps moving forward while carrying their weaknesses.

The grand band sound, enhanced by strings, layers with a passionate vocal performance for a refreshing finish.

This is the ending theme used in the latter half of the first season of the TV anime “That Time I Got Reincarnated as a Slime.” Sung by Azusa Tadokoro, who also appears in the series as a voice actor, it was released as a single in January 2019.

The artist edition includes three tracks in total, such as “Slow Regret,” offering plenty to enjoy.

It’s the perfect anison to fire you up when you want to push through difficulties and move forward with strength.

Be sure to give it a listen when you need a boost of courage!

Miracle soupMindaRyn

MindaRyn – Miracle soup (“That Time I Got Reincarnated as a Slime Season 3” 2nd ED) | Music Video

It’s a very warm ending theme that stays true to the anime’s world.

Using intimate metaphors, it expresses a miraculous bond born from the blending of diverse personalities.

With a gentle country sound, it’s soothing to listen to.

This is the song chosen as the ending theme for season 3 of the anime “That Time I Got Reincarnated as a Slime.” Sung by MindaRyn, a singer from Thailand, it was released in June 2024 and later included on the album “AcrossMiles,” released in August of the same year.

It’s perfect for times when you want to cherish the bonds with your friends or when you’re in the mood to relax.

Highly recommended for those who want to be wrapped in pleasant, acoustic tones.

Please give it a listen while thinking of someone dear to you.

PEACEKEEPERSTEREO DIVE FOUNDATION

PEACEKEEPER

A rock number where a sense of speed surges and beautiful piano melodies intertwine.

With an ensemble that blends a digital texture, it splendidly conveys a grand worldview.

Its deep theme—depicting the resolve to preserve peace and the turmoil of irreconcilable emotions—is compelling.

Chosen as the opening theme for the TV anime That Time I Got Reincarnated as a Slime Season 3, this track was produced by STEREO DIVE FOUNDATION, the solo project of R・O・N, and released as a single in May 2024.

Having worked on music for the same series in the past, it carries a persuasive power born from years of closeness to the work.

It’s a song you’ll want to hear when you’re set on staying true to your convictions.

Its exhilarating tempo gives you a push on the back and the energy to move forward.

ReincarnateTerashima Takuma

Takuma Terashima / “Reincarnate” Music Clip (“That Time I Got Reincarnated As a Slime” ED)

An emotional rock tune that quietly embraces the aftermath of an intense battle, conveying the will to move forward by overcoming pain and loss.

While rooted in anime songs, it captivates with a sound that expands dramatically.

Takuma Terashima, who is also active as a voice actor, wrote the lyrics himself, and the track was released in August 2021 as his 11th single.

It was chosen as the ending theme for Part 2 of the second season of the anime “That Time I Got Reincarnated as a Slime.” The song’s clear, translucent vocals perfectly match the epic worldview of the story.

It’s a must-listen for those who want to overcome hardships and take a new step forward, or who wish to heal their hearts and rise again!