I don't think so. Did you try calling the phone number? I don't think this is a valid number.
This is scam! Just last week I received job offer and investigate about the company and it's legitimate job Scam work from home. Please check in LinkedIn for their so-called independent recruiter the Indian lady "Maria Silva", you can see some comment coming from Indian people also. Other name they're using on their emails are: Hisao Katsuro <[email protected]> and Sakurai Takahashi, sharing the same email address. Be careful folks! "Suizora Group" is a group of Scammer.I don't think so. Did you try calling the phone number? I don't think this is a valid number.
The postal code is for Saitama which they didn't list in the address. And Shogoin Nakamachi, Sakyo-ku is in Kyoto hundreds of kilometers away.
The web site is very basic with not much substance. Plus any real Japanese company would have a Japanese web site. I believe it is NOT legitimate.