For what it's worth I bought the volumes on book walker, I have no idea if we'll get another manga from Tsumoi Hara but I like overall their style even though their manga are not masterpieces.
Trying to understand that ending gave me a headache ...so I gave up. Jokes aside, in case some else is also wondering what an "ssr" is, here is the definition from Urban Dictionaty:
"SSR
A game term for an item or skill. It might also im some Manga, lightnovels and anime. It means Super Supreme Rare."