There are many Nintendo-related products in Japan, as well as many collaborations that Nintendo has made with other companies to bring Nintendo-themed products. The latest example of this was announced by Nintendo earlier today, where the company behind the Switch revealed a collaboration with Suntory for 5 Splatoon 3-themed drinks.
Suntory drinks included in the Splatoon 3 collaboration are 00ml Pepsi Big Zero Lemon, CC Lemon (500ml), Dekavita C Power (500ml), Pop Melon Soda (600ml) and Natchan Ringo (425ml). Each bottle has 2 variants with Splatoon 3 characters on them. They are available in limited quantities across Japanese stores. Buying all 4 bottles in one purchase will also get you a bonus clean file, and you can enter the MA-1 jacket giveaway. The jacket giveaway closes on October 31st.