Rainbow Yokan is a holiday exclusive filling/topping available during New Year in Papa's Sushiria Deluxe and Papa's Sushiria 2. The filling/topping is unlocked with Owen at Rank 8 on Sushiria Deluxe while with Xazzmine at Rank 31.
Rainbow Yokan is a holiday exclusive food available during New Year on Papa's Parkeria. It is unlocked on Rank 62.
Rainbow Yokan is a holiday-exclusive filling that is available to customers during New Year in Papa's Sushiria Deluxe Refined. The filling is unlocked on Day 4 of aforementioned holiday.