This is Booha Adventure, and it connects to the world of my novel Karasuki.
Once you enter, you can review, listen, and practice all the weekly content without going any further. There are three curricula to choose from.
Booha Adventure has no ads, suggested videos, recommendation feed, or generative AI. It is designed for learning, not for monetizing attention or building advertising profiles. From the Study Deck, you can even chat with Uhibon. He knows everything about the app—and nothing about anything else. LOL.
I designed this app to be explored and to get lost in. The further you go, the more you find. Click the maze and you'll see the Booha Ghost flying around. One of them will meet you at the start and guide you to this week's games. Each curriculum has its own set of 9 games and its own theme. The more you play, the more unlocks in Karasuki. That's all I'm going to say.
Play a game and travel to the Karasuki tree. Remember—most trees are doorways to something.
Your account has two profiles for the same journey.
Adventure Log in the Study Deck area is your learning record: Daily Check-ins, weekly study and game progress, and approved English Juku reports.
My Adventure in Karasuki is your adventure record: stars, completed adventures, curriculum progress, achievements, and your wider Booha Adventure journey. Progress can sync to the devices you use. A PIN can be active on only one device at a time.
Curriculum guide
| Curriculum | Approximate level |
| Pre-Boo | EIKEN Grades 5–4 |
| Boo-riculum | EIKEN Grade 3 through Grade 2 |
| Boo-Continuum | EIKEN Pre-1 through Grade 1 · Advanced Communication |
I first built this app for my output-based school. It now connects two lesson pathways that use the same weekly English in different ways. Output Lesson students prepare at home, complete their weekly vocabulary notebook work, and bring a small conversation topic so class time can focus on speaking. English Juku students also review Booha Adventure at home, then use the Juku engine in class to practise and demonstrate their independent understanding. These are not “strong” and “weak” classes; families choose the lesson style that best fits their child.
Each curriculum shows three weeks of study decks at a time: this week, last week, and next week. Each week includes 15 vocabulary words, 15 sentences, and 15 questions, all with full audio and Japanese translations, plus a hands-free stream for listening and repeating.
Daily Check-ins are a short preparation routine for all students. They take about 3–4 minutes and review vocabulary, sentences, and questions from the current curriculum. Students can retake a check-in to practise; their profile records the first attempt and best result.
The app records only the learning information needed to continue the experience. There is no teacher dashboard for following student activity. If a student needs help, they show me the app on their device. Student information is never sold, used for advertising, or used to push content.
Your Booha login:
Your PIN works on one device at a time. If you log in on a different device, the earlier session ends and your profile continues on the new device. Keep your PIN private.