Malaysian nationals holding biometric passport compliance with ICAO standard do not need visa to enter Japan for a short term stay not more than 90 days.
Many schools admit students all year round for a variety of classes(e.g. sushi, ramen, yakitori, tempura and more) ranging from a one-day private lesson to a 3-month course. You are able to stay in Japan and participate a course at culinary schools with a short-stay visa. Course will be held in English and Japanese language is NOT required.
If you want to stay more than 3-month to study, you are required to obtain student visa or cultural activity visa.
To know more about culinary schools in Japan