For some reason.
Watching Boros fight made his battle theme faintly ring in one's ears.
What, that was Saitama's BGM? No, it belonged to Boros too!
Nearly every movement Boros made matched the rhythm of the song perfectly.
Honestly.
Even Imu, floating high above Sea Star, wanted to "manually" play his battle theme for him.
It was a little absurd.
But he had occasionally considered adding such a strange rule to Sea Star.
Whenever people felt some intense emotion, fitting music or songs would appear out of nowhere.
For example, if someone had just gone through a breakup and was heartbroken, a sad melody would begin to play.
Well. Fine, it was pretty abstract.
So the idea had remained only in Imu's mind.
However, the appearance of Tot Musica, the "Demon of Song," surprised him greatly.
It brought all kinds of memories related to Film Red to the surface in Imu's mind.
There was plenty of overly ridiculous stuff among them, such as Uta's number of fans.
But compared to Uta.
The significance represented by Tot Musica's very existence was the real priority.
Namely, Sea Star had originally been connected to a demon world.
Of course.
This was nothing new to Imu.
Because the "former Imu"—his past self—had summoned demons centuries ago and bestowed them upon the Five Elders.
This granted them immortality, while also serving as a means of controlling their life and death.
(Note: Information unclear; may be revised later.)
As for the method of summoning demons, naturally, it was magic.
However, Sea Star's magic differed greatly from the magic of Zero Magic World and Falmart World.
It did not require the caster to possess magical power, but it did require intense desire and imagination.
As long as the correct summoning circle was drawn beforehand and the Sea