Doraemon: the Ultimate King

Two people traveled to the world of Doraemon at the same time. One became Kosugi and the other became Big Bear. They became friends. Big Bear no longer let Doraemon worry about it, and Kosugi became even more powerful. The two experienced experiences in various worlds, became kings of a generation, and reached the pinnacle of life! This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.