Onigiri Shop Mamma

A sister shop to the renowned Onigiri Bongo, this Shinjuku counter-service spot serves freshly crafted, extra-fluffy onigiri made with premium Niigata Koshihikari rice. Diners can watch chefs prepare each rice ball with an almost 1:1 filling-to-rice ratio, featuring options from salmon to spicy toppings alongside unlimited miso soup refills.

Commenters are broadly stunned by the massive, thick portions, noting that one onigiri can easily feel like two servings. While many praise the delicious quality and top-grade rice, several locals push back against the steep price point reaching up to 700 yen per rice ball.