This is a numeric keypad of soft keyboard which inputs 0 to 9 with kanji of Japan, Taiwan, Korea, China.
You can enter a Kanji numeral “〇, 一, 二, 三, 四, 五, 六, 七, 八, 九, 十, 百, 千, 万, 億, 兆, 円” with a single touch.
When you press the shift key, “〇, 一, 二, 三 …” switches to “零, 壱, 弐, 参, 肆, 伍, 陸, 漆, 捌, 玖, 拾, 陌, 阡, 萬, 圓”.
When “令” is pressed, “令和” is entered.
If you press it in succession, it will change to “平成” “昭和” “大正” “明治” “西暦”.
When “年” is pressed, “年月日” is entered.
If you press it in succession, it will change to “午前後” “時分秒”.
Go to Settings > System > Languages & input > and tap Virtual keyboard in the Keyboard & inputs section.
You’ll see a list of each keyboard you’ve installed.
Tap “Manage keyboards”.
Toggle on the new keyboard.
You might see a warning that this input method may collect the text you type including personal information.
But this app does not collect any input content.
This is not a warning specific to this application, it will always be displayed if you select a character input application other than the keyboard that is standard on the device.
If you’re satisfied with the explanation, tap OK.
Note: Instructions will vary depending on your Android OS.
Launch the app you want to type in.
Tap to bring up the keyboard.
Tap the keyboard icon on the bottom right.
(On some devices this icon isn’t present, in that case pull down the notification bar when a keyboard is active.)
Choose the keyboard from the list that pops up.
Download it here