Anyone know how to make a hokkaido style milk/yogurt drink?

Went on a trip to Hokkaido recently and there were a lot of drinkable yogurts available at nearly every 7i and Lawsons.  My favorite one is the one shown in this pic

https://www.tripadvisor.com/LocationPhotoDirectLink-g321549-d2628179-i75834122-Milk_Kobo-Niseko_cho_Abuta_gun_Hokkaido.html

I read in a manga that takes place in a Hokkaido high school that you can make yogurt, i'm hoping the same drinkable type of yogurt, by combining milk and store bought yogurt in a container and then storing that at 40 degrees celsius for a couple hours.  The name of the manga is Silver Spoon, or Gin no Saji if you're wondering.

Has anyone tried this method?  I know the normal method of making yogurt i'm just hoping this method is the method that makes it into that drinkable consistency similar to those drinkable yogurt drinks in Hokkaido. 

rickharris18 days ago

http://www.thekitchn.com/how-to-make-yogurt-at-hom...

Making Yogurt is very easy. Warm milk and a live yogurt to start things off. Keep warm overnight and you have a whole pint+ of tasty yogurt.

You can make it drinkable by adding more milk to get the right texture.

I used to make a lot, but like making bread, without a family to feed it to you end up with far too much.

iceng18 days ago

Interesting pics but I do not know of any secrets and have a very poor success record of reproducing healthy drinks...

I suspect that those delightful drinks are a well kept secret...