いろんなフォントで「mental_case」変換
Zen Old Minchomental_case
Yusei Magicmental_case
M PLUS 1mental_case
Shippori Antiquemental_case
Yuji Maimental_case
Dela Gothic Onemental_case
DotGothic16mental_case
Train Onemental_case
Hira Minchomental_case
Potta Onemental_case
Reggae Onemental_case
Stickmental_case
Zen Kurenaidomental_case
Kosugi Marumental_case
Rampart Onemental_case
Hachi Maru Popmental_case
New Tegominmental_case
RocknRoll Onemental_case
Kaisei Decolmental_case
「mental_case」をコピペできる装飾文字に変換（旧字体・丸囲みなど）
