diff --git a/src/faker/provider/internet/interfaces.nim b/src/faker/provider/internet/interfaces.nim
index 3418151..81756b1 100644
--- a/src/faker/provider/internet/interfaces.nim
+++ b/src/faker/provider/internet/interfaces.nim
@@ -14,3 +14,17 @@ proc safeEmail*(f: Faker): string
 proc freeEmail*(f: Faker): string
 proc email*(f: Faker): string
 proc topLevelDomain*(f: Faker): string
+
+const
+  safeDomainNames = @["example.org", "example.com", "example.net"]
+  freeDomainNames = @["gmail.com", "yahoo.co.jp", "hotmail.com"]
+  topLevelDomains = @["com", "biz", "info", "net", "org"]
+
+proc safeDomainName*(f: Faker): string =
+  f.rand.sample(safeDomainNames)
+
+proc freeDomainName*(f: Faker): string =
+  f.rand.sample(freeDomainNames)
+
+proc topLevelDomain*(f: Faker): string =
+  f.rand.sample(topLevelDomains)
diff --git a/src/faker/provider/internet/internet_en_US.nim b/src/faker/provider/internet/internet_en_US.nim
index 5eeb6fc..eae4219 100644
--- a/src/faker/provider/internet/internet_en_US.nim
+++ b/src/faker/provider/internet/internet_en_US.nim
@@ -2,17 +2,6 @@ include interfaces
 import strutils
 import ../person
 
-const
-  safeDomainNames = @["example.org", "example.com", "example.net"]
-  freeDomainNames = @["gmail.com", "yahoo.co.jp", "hotmail.com"]
-  topLevelDomains = @["com", "biz", "info", "net", "org"]
-
-proc safeDomainName*(f: Faker): string =
-  f.rand.sample(safeDomainNames)
-
-proc freeDomainName*(f: Faker): string =
-  f.rand.sample(freeDomainNames)
-
 proc safeEmail*(f: Faker): string =
   f.firstName.toLower & "@" & f.safeDomainName
 
@@ -26,6 +15,3 @@ proc email*(f: Faker): string =
     else:
       f.safeDomainName
   f.firstName.toLower & "@" & domain
-
-proc topLevelDomain*(f: Faker): string =
-  f.rand.sample(topLevelDomains)
diff --git a/src/faker/provider/internet/internet_ja_JP.nim b/src/faker/provider/internet/internet_ja_JP.nim
new file mode 100644
index 0000000..1e0640d
--- /dev/null
+++ b/src/faker/provider/internet/internet_ja_JP.nim
@@ -0,0 +1,17 @@
+include interfaces
+import strutils
+import ../person/person_ja_JP
+
+proc safeEmail*(f: Faker): string =
+  f.firstRomanizedName.toLower & "@" & f.safeDomainName
+
+proc freeEmail*(f: Faker): string =
+  f.firstRomanizedName.toLower & "@" & f.freeDomainName
+
+proc email*(f: Faker): string =
+  let domain =
+    if rand(1) == 0:
+      f.freeDomainName
+    else:
+      f.safeDomainName
+  f.firstRomanizedName.toLower & "@" & domain