Once Hasbro launched the G1 Transformers brand, Takara quickly joined in as its Japanese counterpart. Since many of the Transformers toys originated from Takara’s prior toy lines, it was only natural that Takara would join in. So, they rereleased many of their toys under the Transformers banner.
Takara’s Transformers toys featured Japanese text on the packaging. More notably, there are a few Transformers toys that never appeared in the western markets, like Deathsaurus. As such, the Japanese exclusives are highly desirable.