diff --git a/frontend/pages/chap1.html b/frontend/pages/riichi/chap1.html
similarity index 100%
rename from frontend/pages/chap1.html
rename to frontend/pages/riichi/chap1.html
diff --git a/frontend/pages/chap2.html b/frontend/pages/riichi/chap2.html
similarity index 100%
rename from frontend/pages/chap2.html
rename to frontend/pages/riichi/chap2.html
diff --git a/frontend/pages/chap3.html b/frontend/pages/riichi/chap3.html
similarity index 100%
rename from frontend/pages/chap3.html
rename to frontend/pages/riichi/chap3.html
diff --git a/frontend/pages/chap4.html b/frontend/pages/riichi/chap4.html
similarity index 100%
rename from frontend/pages/chap4.html
rename to frontend/pages/riichi/chap4.html
diff --git a/frontend/pages/chap5.html b/frontend/pages/riichi/chap5.html
similarity index 100%
rename from frontend/pages/chap5.html
rename to frontend/pages/riichi/chap5.html
diff --git a/frontend/pages/chap6.html b/frontend/pages/riichi/chap6.html
similarity index 100%
rename from frontend/pages/chap6.html
rename to frontend/pages/riichi/chap6.html
diff --git a/frontend/pages/chap7.html b/frontend/pages/riichi/chap7.html
similarity index 100%
rename from frontend/pages/chap7.html
rename to frontend/pages/riichi/chap7.html
diff --git a/frontend/pages/chap8.html b/frontend/pages/riichi/chap8.html
similarity index 100%
rename from frontend/pages/chap8.html
rename to frontend/pages/riichi/chap8.html