Catalyst 四家塾(Yotsuya Juku) is an learning institute startup founded by Will Yotsuya in 2025, inspired by the scientific idea of a catalyst; lowering activation energy to make reactions happen faster and more efficiently, by providing an alternative pathway.

At Catalyst 四家塾(Yotsuya Juku), we act as that Catalyst.

By refining how students learn, think, and practice, we reduce the time and effort needed to understand concepts, while maximizing academic performance and grades. The goal isn’t just harder work, it’s smarter and more more efficient learning that lasts.

All lessons at Catalyst 四家塾(Yotsuya Juku) are conducted via Zoom, allowing us to connect students with exceptional instructors worldwide. By removing geographical limits, we prioritize teaching quality, efficient learning, and measurable outcomes which ensures students learn faster and perform better.

For group classes, all sessions are recorded. If a student is unable to attend a live lesson, the Zoom recording will be shared, allowing them to review the material and stay on track without falling behind. This ensures continuity in learning while maintaining flexibility and accountability.