The Sealed Fortress

Masaomi's bike gets a flat tire. A passerby on a motorcycle helps repair his wheel. As a way of showing his thanks, Masaomi gives the man a special coupon. It is revealed later that his name is Hayate Takamiya, a Toujinshi of the Chi-ryuu. When he and his Shikigami, Aogane no Juuzo, cross paths with Masaomi and Kibachiyo, the battle is going to be intense

Synopsis excerpt via Kitsu.