This song is a joke about a lot of shonen or seinen Manga/Anime/Wuxia/light novel/web novels that I read, that all seem to follow the same trope, where the Main Character (MC) may start out normal or Over Powered, but usually just "for their current power level or stage of cultivation". The story proceeds to pit them into increasingly more ludicrous battles with ever more powerful and about-the-same-amount of arrogant idiots who get stomped by the MC, with the plot dropping the MC into situations where "only people at X power level or below can enter the secret realm to search for treasures'' or similar. Any time the evil and also stupid big brother or parent of some poor sap that has been humiliated or killed by the MC shows up and would rationally end the storyline with "and then the main character was summarily destroyed", the MC is saved by his magical plot armor somehow.

This song is poking fun at the powering up, the leveling up, and the structure of those stories, around the theme of "plot armor". It exists in regular TV and movie media as well, where the hero also somehow miraculously escapes or gets into challenges that somehow only stimulate his or her growth, when the normal outcome of that scenario would be, "and then they died, obviously." Plot armor basically means, until the story is done and the author is through with the character, they simply cannot die due to the magical shield that the author cannot allow it.

One show that really earned my respect was Tengen Toppa Gurren Lagan, one of very few shows or any media I've watched or read where they actually really and truly kill off a main character in a meaningful way, and how the characters carry on and deal with the grief and grow past it is focal to the story; but I would say that it is a delightful exception, rather than the rule.

Plot Armor

F#, C#, G#, D#, BBB B A# G#, BBB B A# G
BBB B A#, 
G#, A#, G#, F#

CH

I'm really strong for my level
In my right eye, there lives a devil
I'll never come to harm, or
all your fans will leave you hardcore

I'm totally safe with my
plot armor

V1

F#, C#; G#, D#, 

I'm gonna start out from the bottom, 
my talent average, or maybe it soars
Or I could be a reincarnation 
with all my knowledge from before

V2
Gonna beat up a bunch of posers
Who try to shame my honor
people losing face all over the place
didn't think such scum was in the human race

CH

I'm really strong for my level
In my right eye, there lives a devil
I'll never come to harm, or
all your fans will leave you hardcore

I'm totally safe with my
plot armor

V3

Never met a death, that I couldn't court
All the bad guys in this story are trash
I mean, couldn't there be one decent villain
before I burn everything to ash?

BR

All your power systems are broken
Can't help but feel they're just token
I've got devil energy, some mana and qi,
how can all that stuff fit in one body

CH

I'm really strong for my level
In my right eye, there lives a devil
I'll never come to harm, or
all your fans will leave you hardcore

I'm totally safe with my
plot armor

outro x4

roses are red, violets are blue
omae wa mou shindeiru

Plot Armor

Siebass