Age: 20s Position: Chief Investigator Height: 174 cm
Chief Investigator and Keigo's subordinate, Masumi was part of the investigation team assigned to protect Father Haiman from the terrorist, Minene Uryuu. Masumi had feelings for Minene and, much to Minene's confusion and dismay, would take every opportunity to ask "her" out for breakfast, lunch and dinner.
He proposes to Minene, who, by that time, has also fallen for him. However, before they could officially get married, he is shot to death.
In the last episode, Minene from the Second World and Nishijima from the Third live together, though it may be considered a 'happy end' for them.
