The song is the Italian anti-fascist folk song "Bella Ciao", more specifically an instrumental/karaoke version of the rendition used as the theme song of Money Heist.

The anime featured in the middle is Yuyushiki.

This is the only anime OP that Moritaka Chisato ever made

I got the video from Niconico

Notes:

For simplicity I chose to render compound particles (e.g. には ni wa, でも de mo) by their meanings rather than as the sum of their parts; likewise for あとになって ato ni natte, I chose to render it as "afterwards" rather than as "later into become-CONJ". Although even this doesn't capture the nuances of the phrase conveying a sense of regret and yadda yadda yadda, but it's a gloss, you know that it can't convey all the exact nuances of the meaning. Like I can't exactly cover the screen in text explaining that, like, 私 watashi doesn't simply mean "me" but is a deictic classifier which in informal speech is associated women, and stuff like that.

The only time where "nuances of meaning" genuinely stumped me here was that I couldn't find a satisfactory way to gloss the わ wa particle, so I just rendered it as (*). Here are a few summaries of how this particle is used:

"わ is a sentence-ending particle that reflects your perception or sentiment based on personal observation and/or experience." https://www.tofugu.com/japanese-grammar/sentence-ending-particle-wa/

"In Japanese, the wa わ particle is a sentence-ending particle used to affirm one's conclusion, decision, opinion, to clarify something, or to exclaim an emotion such as surprise. In a way, it's predominantly used by women, categorizing it as female language." https://www.japanesewithanime.com/2019/06/wa-sentence-ending-particle.html

I glossed ～ている -teiru as CONT even though it's really a combination of the conjunctive and いる iru "to exist" (animate). For godan verbs I also counted the last mora of the root as part of the suffix (o-ita, o-keba, rather than oi-ta, oke-ba).

嫌い kirai is "hated" in the passive rather than past sense. I don't think there's any other points in the gloss that are likely to confuse, but I do worry a little, like what if somebody thinks "do-NOT" is an imperative, you know.

Abbreviations

GEN = genitive, possessive, -'s.

CONT = continuative, i.e. "is doing" as opposed to just "does".

NZ = nominalizer, i.e. turning words of other classes into nouns.

EMPH = emphatic

ADVZ = adverbializer.

CONJ = conjunctive. This is often found in Japanese constructions with auxiliary verbs, I guess it's a bit like the "and" in "go and do something", maybe.

SBJ = subject.

ADJZ = adjectivizer.