Onka Coffee is a specialty coffee shop on the first floor of Mina Tenjin in Tenjin, Fukuoka. Its drinks are divided into Kuro, a drip coffee, and Shiro, a latte, and it also sells desserts and light sandwiches. It opens from 7 to 10 a.m. on weekdays, and customers order by choosing a bean type from a flavor chart. The store is an open format on the mall's first floor, so sitting quietly is difficult.