Pursuit Chapter is the 28th volume in the Mahouka Koukou no Rettousei Light Novel series.
Details from V27 Afterword
The next chapter "Pursuit Arc" is planned to be a top-bottom structure. Needless to say, the main theme will be Tatsuya's pursuit of Minoru, where concurrently one of his First High classmates will be active. This episode has Masaki, his younger sister Akane and Liu Li Lei, for it doesn't end there. "Pursuit Arc" will be something quite eventful.