Melon Cream Soda (or Melon Soda Float) is a very popular classic Japanese drink loved by both kids and adults. It is always available at casual restaurants (so called family restaurants), something like Coke in the US.

A scoop of vanilla ice cream makes the drink frothy and creamy as it melts. Delicious but be careful not to mix all at once or bubbles over. hehe

Recipe is very simple. Therefore you may want to buy a right syrup to get a better result. For instance, the syrup I used was pretty good! Only 3 bucks.

明治屋 マイシロップ メロン (Meidi-Ya My Syrup Melon)
https://amzn.to/3ZqdAlC