The Teenage Spy attends High School

So, this novel is set in the Horimiya universe, in this version of events, Miyamura is replaced by Katsura Takada, a governement special weapon, a teenager, a superspy, due to certain events he gets severley injured, and gets to leave his job, and start leading a normal life, where he encounters Hori san and the gang, after which his life starts to take a turn for the better