The Imperial Japanese Army built a series of subs in late-1944 when the relations between the Army and Navy factions became so bad that the Army decided to torpedo the latter literally.
I jest! No, the IJA was not happy with resupply to the Philippines and other outlying areas and with Navy help managed to design a transport submarine for its needs. These were known commonly as the Maruyu type, officially as the Yu-1 and Yu-1001 type (the latter small improvements such as different propellor).
Fujimi has produced in 1:350 scale this rather small sub, and I have seen them sporadically on the shelves of some model shops, though not often.
I bought extra at the time they were available one each of the kits
400761 or Toku-14 (Yu-1) and 400778, or Toku-15 (Yu-1001). Price of either is 2400 JPY, somewhat lower than the retail price, and shipping is at cost.If anyone is interested, please mail me (see header) or reply to this thread.
Thanks in advance,