I very much look forward to seeing you build this one Kacper.
As I am sure you already know, it is an aircraft of the 523rd Naval Air Group, known as the
Taka Butai (Hawk Unit). Between July 1943 and July 1944, the First Air Fleet gave new code names and designations to its units and used the
Kanji for the unit name as the prefix to the tail codes. You can see the whole list with examples here:
JNAF FIRST AIR FLEET Unit Code Names, 7/43 ~ 7/44: KANJI/English List. (2nd REV)
Taka-4 has a very stylized version of the
Kanji for "Hawk." It appeared on most of the 253 Ku aircraft as
鷹
Don