
Quick answer — Shunsuke Sakai voices Tagami in The Kawai Complex Guide to Manors and Hostel Behavior, Naoki Ookubo in Isuca.
Shunsuke Sakai voices Tagami (The Kawai Complex Guide to Manors and Hostel Behavior), Naoki Ookubo (Isuca).
Tagami is voiced in Japanese by Shunsuke Sakai.