Japan's Muslim presence began not with trade routes but with exile: Volga Tatars fleeing the Russian Revolution settled in Tokyo and Kobe in the 1930s and built the country's first mosques, including the original wooden Tokyo Camii. That community was small and largely faded by the postwar decades, and today's roughly 200,000-strong Muslim population looks quite different — mostly Indonesian, Pakistani, Bangladeshi and other foreign workers and students, alongside a modest but visible number of Japanese converts, concentrated in Tokyo, Kobe and industrial cities like Gunma and Aichi.
Because so many worshippers in Tokyo are factory or convenience-store shift workers rather than members of long-established local congregations, prayer schedules pinned to reliable clock times — not informal sightings — matter more here than in places with centuries-old mosque infrastructure, which is part of why an automated, coordinate-based schedule for the capital is useful rather than decorative.
Japan has no domestic fatwa body of its own, so the Muslim World League's 18°/17° angles, already the default reference used by Tokyo Camii and most Japanese Islamic organizations, are applied here rather than a locally invented standard.
No — that distinction belongs to Kobe Mosque, completed in 1935 by Tatar and Indian Muslim traders; Tokyo Camii's current building dates to 2000, replacing an earlier 1938 structure on the same site.
Tokyo sits at roughly 35.7°N, a mid-latitude that still produces a noticeably longer summer Isha wait and an earlier winter Fajr than tropical Muslim-majority countries, though nowhere near the extremes seen in northern Europe.
Yes — the neighborhood around Tokyo Camii in Shibuya's Oyama-cho area has grown a small halal grocery and restaurant cluster specifically to serve worshippers attending the mosque.
Many Muslim residents work standard Japanese office or factory hours with little flexibility for a midday Friday break, so several Tokyo mosques schedule khutbahs to accommodate lunch-hour attendance rather than assuming a free Friday afternoon.