Chrysalis

In June 2009, in Japan, scientists in Tokyo and Osaka discover a strange planet where the world consisted of the islands of Japan, Sakhalin-Karafuto and Jeju, in a coincidental arrangement of landmasses. That world was stuck in 1047 (technologically) apart from those two scientist colonies. Over four million humans live alongside centaur-type creatures with the lower part of a horse, bear or goat. The rest of the world is dominated by merpeople.

Aaruneben
This is the northernmost point of the islands and corresponds roughly to Wakkanai.