ブーハー・アドベンチャーへようこそ

This is a world, and English is the entry room. You can review and practice all the weekly content without going any further. The study decks, the audio, the games; everything you need for class is right at the start, but the maze is where the weekly games live. And past the maze is something else entirely.

The further you travel, the wilder and darker it gets. Karasuki is one of the doorways. Once you're through it, you might get lost. That's not a warning. That's the point.

Play the games. Unlock the forest. Find the doorways. Discover what opens.

Tests appear on scheduled days. Stars earned each week are yours to keep. Progress inside Karasuki resets every Monday because every week is a different world. Nothing happens the same way twice.

Why I built it I watched students study English, forget it, study it again, and slowly start to think the problem was them. It wasn't. The problem was that English never stayed in one place long enough to feel familiar, and students are never challanged to use it. Booha gives English a place to live and a reason to come back. I challange you.

There are three curricula: Pre-Boo, Boo-riculum, and Boo-Continuum. If you know Eiken, think of it like this:

Curriculum	Eiken Level
Pre-Boo	Around Grade 5
Boo-riculum	Grade 4 to Grade 2
Boo-Continuum	Grade 1 and above

Most students use Boo-riculum. It loops and builds practical conversational English without locking you into a fixed level. Your level is based on how much you use the language.

Inside the Adventure you'll find three weeks of study decks: this week, last week, and next week. Each week includes 15 vocabulary words, 15 sentences, and 15 questions, all with full audio, along with a hands-free stream for listening and repeating. You can also talk to Uhibon. Find that yourself.

This world is based on my novel Karasuki. The story goes deeper than the game. The game goes places the novel doesn't.

This is a private system. Not connected to AI. Nothing is recorded outside your device. Even I cannot see your progress. Your data belongs to you.

The Booha Adventure was built for my school and is included with lessons. Other schools are welcome to use it. I offer a two-week free trial.

PINs	Price
1 PIN	¥500
10 PINs	¥5,000
20 PINs	¥9,000
50 PINs	¥20,000

We do not write during lessons. Writing happens at home so class time can be used for speaking and real communication. Every student keeps a diary. Each week, write the weekly vocabulary in English and Japanese and bring it to class.

Study Decks The study decks are the foundation of everything. Nothing else works properly without them. Every week includes vocabulary cards, sentence cards, and question cards, all with full audio, along with a hands-free stream for listening and repeating.

The vocabulary cards train your ear and eyes to recognize the week's core words quickly. The sentence cards show how those words live inside real English. The question cards prepare you to respond, not just understand, so when it's time to speak you're not starting from zero.

The hands-free stream is where everything connects. You listen, repeat, and move with the language without stopping. This is where rhythm, confidence, and flow build.

These decks are not something you finish once. Come back to them until the English feels familiar.

Game Decks Each week includes 9 games built around the same English you studied.

The games are not separate from the study. They are where you use it. When the study decks feel familiar, the games feel smooth. When you skip the decks, the games feel hard. The system is honest like that.

As you complete games, more things begin to appear and unlock across the Adventure. The more you play, the more the world responds.