Hamazushi removed rotating lanes from 90% of stores, cutting 1,000 tons of waste a year

Kaiten-zushi — sushi on a rotating belt — conquered the world, but the belt hid three costs: sushi riding a public lane must be discarded once it has circulated too long, the exposed product invites tampering, and the kitchen cooks ahead of demand. Hamazushi, the 450-plus-store chain owned by Zensho Holdings, began removing lanes in some stores even before COVID-19, then converted aggressively during the pandemic: by January 2023 about 90% of its stores served through ストレートレーン — straight lanes that carry tablet-ordered plates at high speed directly to the seat that ordered them.

The payoffs are quantified. Hamazushi estimates the shift cuts food waste by roughly 1,000 tons a year — every plate is already sold when it leaves the kitchen. A 2024 Maruha Nichiro survey found 81.5% of kaiten-zushi customers eat more made-to-order sushi than belt sushi. The belt survives as a spectacle, not as an inventory system.

The industry split. Sushiro suspended lane service chain-wide after the 2023 soy-bottle-licking video and is rebuilding belt theatre on digital panels (Dejiro, 19 stores by September 2024). Kura Sushi kept lanes in every store, used AI cameras to cut its disposal rate to about 3%, and in March 2026 earned a Guinness record for the most stores still rotating. Kappa Create, which converted last, fell to a ¥707 million operating loss in the June 2026 quarter. Hamazushi had paid the conversion cost before the hygiene era arrived.

Serve only what was ordered — nothing rides a public belt

A belt turns every plate into timed inventory: sushi that circulates too long is thrown out whether or not anyone wants it.

Made-to-order collapses waste at the source instead of discounting it at the end of the lane.

A per-table straight lane keeps the conveyor speed and motion customers expect, so the format keeps its theatre while the exposed public product disappears.

COVID forced the experiment early; the 2023 tampering videos proved every rival faced exactly what Hamazushi had already engineered away.

The belt was both the format's signature and its cost center: timed disposal and tampering risk on every plate. Made-to-order delivery kills the waste at source, keeping the theatre.

By September 2024 Hamazushi ran about 90% of its stores lane-free and credited the format with roughly 1,000 tons of avoided food waste a year. The market split into two answers to the same problem: Sushiro is rebuilding the belt as digital theatre, Kura defended the classic lane with AI monitoring and a 2026 Guinness record, and late convert Kappa Create — whose president was convicted in 2026 over stolen Hamazushi trade secrets — still slid into a ¥707 million quarterly operating loss. Straight-lane, order-first service is now the default blueprint for hygiene-era conveyor sushi.