I have come across some friend playing IKASU golf so I did some research on it. It seems to be a premium forged from Himeji. The Tour Blade version looks identical to Yururi flat back. How good is this brand compare to other JDMs like Yururi or Epon?!?

I've seen them, they use pretty generic designs or if you'd like "classic" designs. They look a lot like Kyoei forgings but not sure. The ones I have seen look really clean and nice, the finish is spot on. So, a high quality japanese forging, with excellent finish but not with new tech or ground breaking designs.

Possibly using catalog heads?

the cavity back is exactly like a gauge design fcb i used to have.

Man that CB is a 12 year old open model head.

The blade well there have been many variations of it used by a variety of different companies.

These are made by Kyoei and they basically have stamped their logo on a pre made design.

Ikasu is not even a Japanese brand, just a Japanese name. As people mentioned they use Kyoei open models.