Restaurants in Japan are quite outdated in terms of dietary restrictions or food allergies. Yet, halal is recently widely known in Japan and more and more restaurants are trying to get halal certifications. Below are restaurants that offer halal meals in Tokyo.

This is the website called Halal Gourmet Japan. You can check for the halal restaurants throughout Japan.
https://www.halalgourmet.jp

<Asakusa>
Asakusa Sushi Ken

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Address

2-11-4 Asakusa, Taito City, Tokyo

<Asakusa>
SEKAI CAFE

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 Address

<Asakusa>
Halal Mentei Naritaya Asakusa

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Address

2-16-7 Asakusa, Taito City, Tokyo

<Asakusa>
HALAL Japanese Restaurant ORIGAMI Asakusa

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Address

1-2-8 Hanakawado, Taito City, Tokyo

<Asakusa>
Gonpachi Asakusa Azumabashi

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Address

2-1-15 Kaminarimon, Taito City, Tokyo

<Shinjuku>
Halal Ramen Ouka

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Address

1-11-7 Shinjuku, Shinjuku City, Tokyo

<Shinjuku>
Yoshiya Shinjuku branch

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Address

1-1-2 Nishishinjuku, Shinjuku City, Tokyo B1

<Ginza>
Tendon Itsuki

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Address

3-1 Ginzanishi, Chuo City, Tokyo