It seems Tenjin Minami quit the battle. Basically, there are at least 3 endings for Jirou(Akari, Shiori, harem...)
Obviously Akari shows up on each volume's cover, which implys something, but it could be creative(Shiori/harem ending), or continue to be complex(Tera joins the battle/Minami's bro broke up with his gf...)
Just as the comic says, this summer might be full of storms and waves.