Yesterday (May 7), the Nikkei stock average jumped 3,320 yen.
The largest single-day gain on record, with a closing price of 62,833 yen marking an all-time high. Apparently, investors rushed into AI and semiconductor stocks driven by the "fear of not owning."
…and what were we private tutors doing meanwhile? Getting ready to start calculating monthly tuition fees as the month-end approached.
While the world is up 3,320 yen, here we are staring down Excel for tuition calculations. Doesn't that seem a little wasteful?
Stock prices rise on the "fear of not owning." Tutoring admin work steals time on the "fear of holding on." If you can drop it for $5 a month, you should drop it.
Private Tutors Doing the Opposite of "Fear of Not Owning"
The Nikkei article used the phrase "fear of not owning."
The fear of missing out on a rising market by not holding AI and semiconductor stocks
Makes sense. Investors move out of fear of "losing out by not owning."
Meanwhile, what about us individual private tutors?
"Fear of not owning"
→ Profit by holding
"Fear of letting go"
→ Burn out by holding onto admin work
The spreadsheet for tuition tracking, handwritten lesson records, PDF invoices made at month-end, LINE reports to parents—none of these earn you a single yen by holding onto them.
If anything, the more you carry, the less time you have for lesson prep, and the quality of your teaching drops.
"What You're Holding vs. What You're Losing" by the Numbers
Here's a rough estimate of month-end admin work per tutor.
At 3,000 yen per hour, that's an opportunity cost of 108,000 to 144,000 yen per year.
In Nikkei-gain terms, well, it's nowhere near 3,320 yen, but converted to your own hourly rate, it quietly hurts.
How the Kagemusha System "Streamlines" Your Work
Kagemusha System is a tool that fully automates tuition management, lesson logging, and invoicing for private tutors—all for just 500 yen per month.
The mechanism is simple.
Add lessons to Google Calendar
Just enter "Student Name - Math" in the calendar you already use.
Lessons are logged automatically when finished
Lesson dates, times, and student names accumulate automatically in your own Google Spreadsheet.
PDF invoices generated automatically at month-end
Lesson counts × hourly rate are tallied per student, and PDF invoices are generated with one click.
All that's left is to send
Just attach to email or LINE for parents and your month-end work is done.
All your data stays inside your own Google account. Nothing is sent to an external server. So there's no risk of personal information leaks either.
Manual vs. Kagemusha System (Investor-Style Comparison)
| Item | Manual (the "hold on" camp) | Kagemusha System (the "let go" camp) |
|---|---|---|
| Month-end fee calculation | 2 hours (battling with a calculator) | 0 minutes (auto-tallied) |
| Invoice creation | 1 hour (typed manually in Word) | 0 minutes (PDF auto-generated) |
| Lesson logging | Handwritten every time | Automatic via calendar sync |
| Calculation errors | At least once a month | Machines don't make them |
| Cost | Time (priceless and painful) | 500 yen/month |
You can drop something that costs you just by holding onto it for 500 yen a month. As a "don't-hold-it" strategy, that's not a bad deal.
Frequently Asked Questions
Final Thoughts
The day the Nikkei surged 3,320 yen to set a new all-time high.
While investors around the world are moving on the "fear of not owning," maybe we tutors should be moving on "the fear of holding onto admin work."
If you can buy back 3-4 hours each month—40+ hours a year—for just 500 yen a month, doesn't that sound like a pretty solid "investment"?
At the very least, as an option for ditching that future of wrestling with a calculator at month-end, it's worth knowing about.
A tuition management and automatic invoice generation tool for individual private tutors. Automates lesson logging via Google Calendar integration and generates PDF invoices with a single click. Everything is contained within your own Google account. Just 500 yen per month, with setup completed in 5 minutes.
→ Check out the Kagemusha System
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