Ditch the convenience store onigiri rice balls for the ones at Bimi Musubi Uma, each made to order and served warm. The standard lunch set menu (¥900) comes with a small bowl of soup curry, two appetisers of the day, housemade pickles and one plain onigiri wrapped in seaweed. For an additional ¥100, you can make that two onigiri, or if you think you can eat three rice balls, just chip in an extra ¥200.
You can also opt for fillings like tuna mayo, ume shirasu (plum and whitebait), and mentaiko (pollock roe) for an extra ¥50 if you want to change it up.