Another thing is there were romaji spacing mistakes that no one seems to have picked up. I've read the romaji standard for gendou, the particles were not spaced or joined as they should be.

It isn't Suzuna who's singing. If anyone bothered to look at the ending credit during this closing, you would see that the character and its seiyuu whose singing. It clearly says Anezaki Mamori (Hirano Aya), read the kanji for the name