![[2026] Summary of Opening, Ending, and Insert Songs from That Time I Got Reincarnated as a Slime](https://i.ytimg.com/vi_webp/CwZRaiVmfPE/maxresdefault.webp)
[2026] Summary of Opening, Ending, and Insert Songs from That Time I Got Reincarnated as a Slime
Beloved as the very byword for isekai reincarnation fantasy—and widely known by its nickname “Tensura”—That Time I Got Reincarnated as a Slime.
Each time the franchise expands, from the TV anime series to side stories and even a feature film, the opening and insert songs that color the story set our hearts racing.
A track that swells during an epic battle, a song that gently wraps around the bonds between characters—these pieces, which resonate deeply with the world of the series, instantly rekindle that excitement and emotion the moment you listen.
In this article, we’ll take a broad look at the history of Tensura’s theme and insert songs.
Come along with us on a journey to find your new favorite track!
[2026] That Time I Got Reincarnated as a Slime Theme and Insert Songs Summary (1–10)
UtopiaNEW!TRUE
This piece was created as a blue love song that resonates with a world set on an azure sea.
Sung by TRUE, it’s a dramatic pop song brimming with aching sadness and crystalline clarity.
Chosen as the theme song for the anime film That Time I Got Reincarnated as a Slime the Movie: Azure Sea of Tears, released in February 2026, it was also issued that month as the first track on the single “Azure Sea’s Shimmer.” This marks her sixth collaboration with the series, and the long-nurtured trust between them breathes beautifully within its cinematic melody.
The result evokes a yearning that feels almost within reach yet remains distant, and a prayer for a world she wants to protect.
It’s the perfect number for those who want to experience deep emotion on a big theater screen, or to surrender themselves to a quiet passion.
Nameless StoryNEW!Terashima Takuma
This song brilliantly captures the exhilarating feeling of gaining a new role in another world and boldly forging a path through the unknown! Its dramatic, fast-paced rock sound and theme of facing straight ahead will set your heart ablaze.
It served as the opening theme for Season 1 of the anime “That Time I Got Reincarnated as a Slime,” with lyrics written by Takuma Terashima—who is also active as a voice actor—and was released in October 2018 as his eighth single.
This track is perfect when you need the courage to dive into unfamiliar territory.
Listening to its uplifting melody will surely give you that push to step forward into the future!
Like FlamesNEW!MindaRyn
This anime song, bursting with a sense of speed and rock energy, sets your heart ablaze.
Sung by the trilingual artist MindaRyn, its blend of English and Japanese is especially captivating.
Her powerful vocals are overwhelming, as if voicing the protagonist’s cry to ignite their fighting spirit for their friends.
Chosen as the opening theme for Part 2 of the TV anime “That Time I Got Reincarnated as a Slime” Season 2, it was released as her second single in August 2021.
It was also included on her album “My Journey,” released in December 2022.
With over 20 million views on video platforms, it’s beloved by fans worldwide.
It’s the perfect track when you need the courage to face hardships or want to fire yourself up and boost your energy!
STORYSEEKERNEW!STEREO DIVE FOUNDATION
An electro tune that opens with flowing piano tones and then surges forward with a bold, marching beat.
The lyrics stylishly depict the sense of loss when something precious is gone and the moments when life forces you to make a choice.
This track was used as the ending theme for Part 1 of the anime “That Time I Got Reincarnated as a Slime” Season 2.
It’s a single from STEREO DIVE FOUNDATION, the solo project of R・O・N, released in February 2021.
It was also included on the album “STEREO DIVE 02,” released in April 2022.
The song delivers a refreshing finish that conveys a sense of narrative depth.
Perfect for quietly facing your emotions and taking your next step forward.
Another colonyNEW!TRUE
An energetic number that expresses the creation of a new community in another world and the will to move toward tomorrow.
TRUE’s powerful vocals and the exhilarating rock sound resonate deeply.
It vividly portrays the characters as they press forward in pursuit of their ideals.
This track was used as the ending theme for the first cour of the first season of the anime “That Time I Got Reincarnated as a Slime” and was released as a single in November 2018.
It was also included on the 2021 album “Kotoba Asobi” and remains a staple at live shows to this day.
It’s the perfect anison for those who want to start a new challenge or find a place where they belong.
Experience the thrill of stepping into the unknown together with this song.
StorytellerNEW!TRUE
Isekai reincarnation stories really capture a lot of hearts, don’t they? This song was chosen as the opening theme for Part 1 of the anime That Time I Got Reincarnated as a Slime Season 2.
Created by TRUE, a singer who also excels as a lyricist, it’s a pop-rock number that portrays bonds with companions and a forward-looking growth that carves out one’s destiny.
Released in January 2021 as her 16th single, it was later included on the album Kotoba Asobi.
Its grand, exhilarating melody truly evokes the feeling of the start of an adventure! The powerful, hope-filled vocals are inspiring too—an anime song that gives you courage.
It’s a great track to listen to when you want to take on something new or boost your spirits.
To You Within MeNEW!TRUE
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 fireworksNEW!Yoihanabi · Rimuru (CV.Okasaki Miho)
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 AroundNEW!Terashima Takuma
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 SoldierNEW!Azusa Tadokoro
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!