Saitama Bousou Saizensen Flag! Shinimonogurui no Seishun!!

So ill be honest this anime was a pain to find, and I'm almost for sure that it could be considered lost media. I logged it on internet archives if anyone would like to watch it. Considering I could only find the raw and not subtitled at all, I probably didn't fully understand the story. One thing to note is that the Japanese Wikipedia article lists Kumi, one of the characters, as Aya Hisakawa (she plays Sailor mercury in sailor moon) but HER Japanese Wikipedia article does not state that she plays Kumi. After looking through niconico though, it seems like a user does confirmthat she is Kumi AND that she sings the ending theme song "Sunday" but a user on youtube sources it as "Daijoubu!!" but both do say it's by Aya Hisakawa, so there's that. The anime was charming from what I could tell, without even understanding the language some of the gags made me chuckle