Mikage has decided that one day he's going to find Hiroki in the library and just study ~quietly~ to see how Hiroki'll handle it. Hiroki's attitude of flustered grumpiness draws Mikage like a magnet. It's fun! It's cute! It reminds him of Teito and makes him figure that Hiroki needs more friends. The lonliness circle confirmed that latter part sharply, and so he has determined that he's going to hang around and become Hiroki's friend!! IT'LL BE GREAT.