Make Every Answer a Strike Against the Enemy

Lexicon Odyssey is a single-player game that combines Japanese learning, auto-battling, and RPG buildcrafting.

Here, learning is no longer a tedious series of disconnected exercises.

Begin with the Japanese kana, learn vocabulary and grammar through expedition after expedition, develop your own combat build, and meet the companions waiting at your camp as you embark on—

A Long Expedition from Complete Beginner to JLPT N1

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A Learning Path Designed for Complete Beginners

Even if you have never studied Japanese before, you can begin with hiragana and katakana.

The game guides you through kana explanations, stroke order, recognition, romaji input, and more, using milestone assessments to confirm what you have learned. Begin with the kana, then progress through N5, N4, N3, N2, and N1—turning the Japanese you truly learn into your character’s strength.

If you already have experience with Japanese, you can choose the level that best matches your current ability.

A Massive Library of Learning Content

- A complete kana learning course

- More than 9,230 JLPT N5–N1 vocabulary entries

- More than 590 JLPT N5–N1 grammar points

- More than 21,500 Japanese example sentences

- More than 18,400 example sentences with structural or usage notes

- More than 2,300 memorization and differentiation tips

- More than 500 extended grammar explanations

The learning content covers Japanese kana as well as vocabulary and grammar from JLPT N5 through N1.

Vocabulary entries do more than display an isolated definition. Study cards include the Japanese spelling, kana reading, part of speech, definition, example sentences, sentence readings, and easily confused alternatives. Many entries also include additional examples, sentence breakdowns, usage contexts, and memorization tips.

Grammar lessons explain how each structure is formed, what it means, when it is normally used, and how it differs from similar expressions. Example sentences do more than provide translations: they also explain why particular particles, word forms, and sentence structures are used.

A Carefully Designed Learning System

The learning process in Kotoba Expedition is divided into comprehension, active recall, error correction, and spaced review.

When you first encounter new material, the game presents its reading, meaning, examples, and explanation. The answer is then hidden so that you must actively recall it. As your proficiency increases, the available question types gradually expand from basic definitions to:

- Recalling Japanese from its meaning

- Identifying the meaning of Japanese words

- Distinguishing kanji readings

- Completing example sentences

- Kana and romaji input

- Kana listening exercises

- Mixed vocabulary and grammar assessments

Incorrect material enters the error-correction process, and its review interval is adjusted until you can recall it correctly again—and eventually demonstrate that you have truly learned it.

The game uses a spaced-review system to schedule previously studied material. Repeating the same question several times in a single day will not be mistaken for long-term mastery.

Only knowledge that can still be recalled after time has passed is considered securely learned.

A range of settings is also available during study expeditions, allowing you to reduce or disable distracting battle visuals and sound effects.

Learning Does Not Have to Be Boring

Expeditions offer more than numerical progression. The game also features a complete RPG build system:

- More than 290 pieces of equipment, including over a hundred weapons and accessories

- More than 140 collectible spells

- Distinctive effects for every piece of equipment and every spell

- Dozens of enemies with different traits and combat mechanics

Equipment and spells can be combined around different build concepts, creating distinctive trigger chains and combat loops.

Japanese learning and combat take place at the same time during every expedition. Develop your character, collect equipment, and grow stronger as you learn.

The Japanese you study is no longer something abstract—it becomes real power within the game.

Travel across this land with the power of language, reach the end of the expedition, and uncover the secrets buried behind its words.

Learning Does Not Have to Be Lonely

Companions with different personalities and pasts will gradually arrive at your camp.

The game contains more than a thousand NPC dialogue nodes. Your companions do more than distribute rewards: they remember important events from your journey and, as your bond deepens, gradually open up about their pasts and the choices they have made.

Meet new companions and grow together throughout your studies and adventures.

Take Up Your Weapon and Open Your Dictionary

This Time, You Are Not Simply Studying Japanese at a Desk—you are embarking on a learning journey with a purpose.

Every Word You Truly Learn Will Carry You Further.