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I'll research what makes certain foods and seasonings a constant part of daily life in Japan, then pull out actual cases and long-tail demand patterns for your product strategy.

Solid, direct statistics on "constant daily demand" are thin. Most category data is paywalled trade press, so I switched partway to actual cases: foods that became daily staples, and fads that settled into routine. Figures below come from visible excerpts, so treat them as indicative. Dates are the publication dates where available.

1. The structural backdrop

Food is the largest household expense. In 2025, two-plus-person households spent ¥89,754 per month on food, 28.6% of consumption spending. This is the base demand, but it says nothing about which products ride on it. Source: Statistics Bureau of Japan, 2025 household survey data

Even the most basic staple is shrinking. Household salt sold through retail fell 3.1% in FY2023, and the decline has continued since a sharp drop in FY2020, as reduced-salt eating has taken hold. Daily use does not guarantee growth when population and health trends push against it. Source: Nissyoku salt feature, 2024-08-30

2. Cases that became constant daily demand

Mentsuyu (noodle and all-purpose soup base). The trade press describes it as established as a modern foundational seasoning usable across Japanese cooking. Yamaki's FY2024 results rose 8% in value and 2% in volume, driven by a mid-size 500ml format, even after price revisions. The growth is in a pack size matched to usage frequency. Source: Nissyoku tsuyu feature, 2025-04-02

Furikake and ochazuke. The market is expected to hit a record in FY2025, with furikake expanding for a fourth straight year. The stated driver is its economics as a stand-in for a side dish, which fits the real-wage squeeze and rising rice prices. Source: Nissyoku furikake and ochazuke feature, 2025-08-25

Nori crop failures and price spikes force yearly price revisions on ochazuke, yet volume loss has been kept minimal, which suggests habitual buyers. Mishima Foods' household line, led by its Yukari series, grew 4.5% in FY2025 (company total ¥15.2bn, +1.1%). Sources: Nissyoku, 2025-08-25 and Nissyoku, 2026-04-27

Curry. Curry appears on the table more often even amid rice price rises, because it is a one-dish meal using relatively stable-priced root vegetables. The form has shifted from roux toward retort: retort overtook roux in market size in FY2017, driven by smaller households and dual-income cooking changes. Demand for the meal persisted while the format moved. Sources: Nissyoku curry feature, 2025-07-02 and Nissyoku curry feature, 2019-07-01

3. Fads that settled into routine

Taberu rayu (eat-it-as-a-topping chili oil). Per Intage data, the rayu market was ¥1.3bn in 2008, jumped to ¥12.1bn in 2010, and stood at ¥4.1bn in 2020, about 3x the pre-boom level. The lasting change was in use occasions: onigiri and cold tofu, both uses the product promoted, ranked 2nd and 5th among menus using rayu in 2020. Scale reference from the same source: tube ginger ¥8.2bn, wasabi ¥8.0bn, garlic ¥6.4bn. Source: Toyo Keizai / Intage, 2021-11-17

Single-serve nabe tsuyu. Launched in 2012 for one-person hot pot, it reached ¥8.2bn by 2020, about 16x its 2012 level and over 20% of the nabe tsuyu market. This is a clean example of a shrinking-household trend creating a new constant-use format. Source: Toyo Keizai / Intage, 2021-11-17

Shio-koji. Only weak evidence: a lifestyle site says the boom faded but it settled in as a standard seasoning. I found no sales data to confirm this. Source: Kinarino, undated

4. Long-tail patterns

Regional variation is large even for a national staple. For curry roux, average annual spend was ¥1,395 nationally (2019 to 2021), with Niigata City highest at ¥1,756 and Mito City lowest at ¥1,159. That is a 1.5x spread within one category. Source: Financial Field, 2019-2021 survey data, undated article

Regional spice to national staple. Yuzu kosho began in Kyushu roughly 50 years ago and only recently reached supermarkets nationwide, now used even at udon and soba shops alongside shichimi. Source: Matcha, undated

Existing staples are being split into enthusiast niches. Mizkan is targeting people fond of garlic or spicy flavors with a tsuyu line, aiming to relieve boredom with noodle menus. Source: Nissyoku tsuyu feature, 2025-04-02

New occasions extend a staple. House's seasoned curry powder, launched in 2019, spread from main dishes into snacking and drinking menus. Nagatanien is pushing cold soy-milk ochazuke as a summer use for ochazuke. Sources: Nissyoku curry feature, 2021-07-02 and Nissyoku, 2026-04-27

Gohan no otomo (rice toppings) fit time-pressed moments. A specialist who has tried 1,500+ varieties says they shine when there is no time to prepare a side dish, in bento, and as drinking snacks. Source: Roomie, 2022-12

5. What this suggests for your strategy (my inference)

1. Anchor to a meal occasion, not an ingredient. Curry, mentsuyu, furikake and ochazuke each own a repeatable occasion (one-pot dinner, all-purpose base, rice side, morning routine).
2. Fads last when they change how people eat. Rayu survived because it became an onigiri and tofu topping, not because it was spicy.
3. Shrinking households and time pressure create constant demand for small formats. Single-serve nabe tsuyu, retort curry and mid-size mentsuyu all fit this.
4. Price-tolerant staples have a cost-effectiveness story. Furikake and ochazuke held volume through price rises.
5. Long-tail entry points are regional and enthusiast-driven, not mass-market. Yuzu kosho and the garlic/spicy tsuyu are examples.

Gaps: I found no clean per-household "use frequency" data, and Statista, Euromonitor and GlobalData figures were paywalled. If you tell me your product category, I can search for the closest comparable cases and regional data.