1. Make sure that there is Japanese keyboard, either Kana or Romaji, in Settings > General > Keyboard > Keyboards.
2. Additionally, make sure that Automatic or U.S. is selected for the Japanese keyboard in Settings > General > Keyboard > Hardware Keyboard.
3. The Japanese language code is JA, represented by the numeric 6, 4.
4. The language at L3 can be any Roman alphabet language. The initial factory setting is English.
5. The language at L4 can be any language. The initial factory setting is none.
6. The Japanese language can be set at L4.
7. To set the Japanese language at L4, press L3 + L1, L4, 6, 6, 4.
8. To unset the language at L4, press L3 + L1, L4, R1.
9. Roman alphabet letters and common keyboard symbols are as in Rivo alphabet layout and Rivo symbols layout.
10. Letters in Japanese are assigned to each number button as follows:
| 1 | あ, い, う, え, お |
| 2 | か, き, く, け, こ |
| 3 | さ, し, す, せ, そ |
| 4 | た, ち, つ, て, と |
| 5 | な, に, ぬ, ね, の |
| 6 | は, ひ, ふ, へ, ほ |
| 7 | ま, み, む, め, も |
| 8 | や, ゆ, よ |
| 9 | ら, り, る, れ, ろ |
| 0 | わ, を, ん |
11. Additional symbols can be typed in symbol mode as follows:
| ー | R2 + 5 |
| 「 | R2 + 7 |
| 」 | R2 + 9 |
| ・ | R2 + * |
| … | R2 + 0 |
| ¥ | R2 + L1, 2 |
12. To type Japanese Hiragana, follow these steps:
12.1. To set Rivo to type Japanese hiragana, press L4.
12.2. If the iPhone's current keyboard is not set to Japanese, press L4 or L3 + L4 repeatedly until Japanese is selected.
12.3. To type a letter in a button, press the button repeatedly until the desired Hiragana letter is entered.
12.4. To change the current Hiragana letter to its small form, dakuten or handakuten, press L2.
13. After typing a Hiragana letter or word, follow these steps to select its Kanji version:
13.1. To select the next candidate, press #.
13.2. To select the previous candidate, press R2 + #.
13.3. To navigate backward or forward between candidates, press R2 + 4 or 6.
13.4. To move to the previous or next line in the candidate table, press R2 + 2 or 8.
13.5. To move the cursor within the current input word while typing, press R2 + 1 or 3.
13.6. To confirm the current selection, press R3.
13.7. If you want to type Hiragana letters without selecting Kanji, press R3 right after typing the Hiragana.