|First appearance: Otaku no Video|
|Voiced by: (Uncredited)|
|Height: 1.69m (5 ft 6.54 in)|
|Interests: Sleeping during the day, reseaching at night|
Part of the otaku circle, Tsurumaki is their night owl. With his noctural habits, the research can continue around the clock. During the day, he is often found snoring on the floor.