Main Gameplay Story Characters Music Miscellaneous

Title screen
Water from the Bottom Flowing Out to the Surface



This is the title screen theme song.

This was the first track that I wrote after I was requested to do them. As I thought about the sound of water, I settled with something related to water - a calm feeling.

Stage 1 theme
大洋の風情 ~ Fantastic Sea
Grandeur of the Ocean ~ Fantastic Sea



This is the Stage 1 theme song.

Originally I did not compose this for the game. I then made it more light-hearted and befitting. In the beginning, I had the image of strolling aimlessly in the sky.

Stage 1 Boss - Konoha Susanomori's theme
The Pot Sum of an Uncaptured Raccoon

 須佐乃森 このはのテーマです。


This is Konoha Susanomori's theme song.

The sound track that changed. The image came from Ten Desires... NOT, the tanuki in Touhou Sangessei. As I saw the tanuki in the book, I came up with the idea of giving it an innocent air.

Stage 2 theme
Giant Prospect of a Water Mass



This is the Stage 2 theme song.

As I heard the wind ensemble on top of the original melody line, I thought, "why not use this?" Although I used the same saxophones as in the old stage 1 boss theme as well, that one felt a bit less energized.

Stage 2 Boss - Naruko Uzushima's theme
Naruko Stream

 渦島 鳴子のテーマです。


This is Naruko Uzushima's theme song.

The source is obviously Mountain of Faith. I aimed to make it a high paced theme. As the character design of Naruko was fairly polished, I tried to match the theme to her.

Stage 3 theme
海燕の鳴動 ~ Natural Forecast
Echo of a Sea Petrel ~ Natural Forecast



This is the Stage 3 theme song.

The source really is Undefined Fantastic Object. About this theme, I timed it for the atmosphere change in midboss Miyo. I tried to re-time it for every update of the game - those were fun times.

Stage 3 Boss - Tsubame Minazuki's theme
The Singing Leader Looks Up to the Sky

 水無月 つばめのテーマです。


This is Tsubame Minazuki's theme song.

3/4 time. That'd be the distinguishing feature. There is also the aspect of the changing phases which made the sound deeper. Because of that, at times there are 2 base lines.

Stage 4 theme
未開拓世界 ~ インナースペース
The Unexplored World ~ Inner Space



This is the Stage 4 theme song.

From now on I compose with an underwater atmosphere. While the places before are normal places to walk around in, from now on we enter the unknown world. As this is the rumored unexplored world, the theme elicits nervousness appropriately.

Stage 4 Boss - Kasumi Shindou's theme
Submarine Illusion

 深堂 香澄のテーマです。


This is Kasumi Shindou's theme song.

Originally this was not a soundtrack of the game. As it came to be used, I've made it more game-like. The few traces of science are due to the original concept being genetics.

Stage 5 theme
二百海里は宴もたけなわ ~ Prayed Feast


A Party's Climax 200 Nautical Miles[2] Over the Sea ~ Prayed Feast



This is the Stage 5 theme song.

A song based on the architecture of the stage. The first idea appearing in my mind was "welcome to the undersea palace." Then, somehow I felt that the palace will welcome people in this sort of feeling.

Stage 5 Boss - Megumi Yaobi's theme
Could a Mermaid Dream of Being a Human?

 八百比 恵のテーマです。


This is Megumi Yaobi's theme song.

A theme based on the title. It was composed with the feeling of "ah, looks like I'm not welcome" after I read the conversation. I also took some inspiration from other works I've uploaded to Nico Commons.

Final Stage theme
Fountain of Youth



This is the Stage 6 theme song.

As for the theme of the last stage, I tried not to make it too long. Initially I composed it in 10/4 time, but in the end I settled for 5/4 time because otherwise it'd be too unbearable to listen to without earphones. Inspiration for the song came not from Rural Makai City Esoteria, but from Fires of Hokkai.

Final Stage Boss - Mikoto Yaobi's theme
深海七花 ~ Forgotten Benefit
Seven Flowers of the Deep Sea ~ Forgotten Benefit

 八百比 海琴のテーマです。


This is Mikoto Yaobi's theme song.

As it was the only place in the game to shout out"laaaasst boss!!!!" I made it a bit wild. It was quite difficult trying to think up ideas while staring at the soundless stage. This was probably the song requiring the second most thought in the game.

Extra stage theme
Footprints of Trieste [3]

This is the extra stage theme song.

Extra stage Boss - Otohime Kanpukugu's theme
The Butterfly of Isaac the Traveler

観福宮 ()70]-[!|v|£のテーマです。
This is Otohime Kanpukugu's theme song.

Ending theme
Ebb Tide



This is the ending theme song.

This was made with the image of drifting objects being washed ashore. Particularly, the background is somewhat similar to the famous "Hamabe no Uta."

Staff roll theme
海乙女の詩 ~ Cobalt Dream
Poem of the Ocean Maiden ~ Cobalt Dream



This is the staff roll theme song.

This track was changed quite a bit before release. Originally the idea was simply to make it ocean-like. However, later the piano of the stage 6 boss theme was added.

Score theme
Sea Level -Umimo-

This track follows the regular Player's Scores closely. The melody was part of an unreleased prototype of the extra stage theme.


  1. According to the music composer's blog, it should be "Preyed Feast"
  2. A nautical mile is a unit of measuring distance in navigation, defined as equal to 1852 metres. 200 nautical miles would equal 370.4 kilometres, or approximately 230 miles.
  3. Trieste is the only manned submarine to ever reach the bottom of the Mariana Trench.

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