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Hello! This is Tejima from GogoJungle.
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For this special interview project, we invited a part-time trader who has focused on short-term trading centered on FX over 17 years and“earned more than the price of a house”in cumulative profits:“Tokoya”.
While working full-time as a medical engineer, Tokoya has continued to hone his skills through self-study. In this first installment, we trace his 17-year journey and explore the question of “why so many traders can’t win.”
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Medical Engineer × 17 Years as a Trader
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Tokoya
Began FX trading after the Lehman Shock and has 17 years of trading experience. Centered on FX (day trading and swing trading), he has achieved cumulative profits in the tens of millions of yen.
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| Table of Contents |
| 17 years of side business × FX. Profits have become “more than the price of a house” |
| From lucky success to a turning point. “Systematizing rules” changed everything |
| “Market context” matters more than entries. Why trades without conviction lose to emotion |
| The real reason people leave EAs. Understanding the “logic” is what separates survivors |
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17 years of side business × FX. Profits have become “more than the price of a house”
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While working full-time as a medical engineer, Tokoya has continued short-term trading in FX and stocks for 17 years. His accumulated profits amount to tens of millions of yen—equivalent to “more than the price of a house.”
His style centers on short-term trades: day trading and swing trading. Behind that seemingly simple style lies 17 years of trial and error and concentrated learning.
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From lucky success to a turning point. “Systematizing rules” changed everything
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Tokoya started trading around the time of the Greek shock. His initial results were excellent—but he says it wasn’t due to skill.
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❝
“Back then, it was basically a lucky punch; I made a lot because I caught the sharp crash. Because I happened to catch it, I traded afterward without any logic at all, and from there I kept racking up losses.”
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He kept buying highs, entering at tops and bottoms only to be stopped out on reversals. After this vicious cycle continued, Tokoya made a decision.
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❝
“I realized this was bad, so I studied very thoroughly and systematized my rules—that was the turning point where I became profitable.”
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He relearned systematically with technical analysis as the core while also incorporating fundamentals. He thencodified the lessons learned from real trading into rulesand integrated them into his own approach—this work laid the foundation for his multi–tens of millions in profit.
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Lesson
Systematize what you learn and rigorously create rules with reproducible conviction
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“Market context” matters more than entries. Why trades without conviction lose to emotion
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Through continued study, Tokoya arrived at an important realization. Many traders tend to focus on “where to enter,” but in fact, the prior step—market context—is what determines victory or defeat.
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“Technical entry points are very important, but I feel even more strongly that understanding the market context is crucial.”
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He further points out that trades withoutconvictionare ruled by emotion. When losses occur, you can’t hold the position and end up cutting too early; when profits appear, greed creeps in and you take profits too late—
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❝
“If your basis isn’t solid, you lose confidence in your own trading. When you take a loss, you can’t hold the position and you cut it. When you’re in profit, greed takes over, and as a result the profit keeps shrinking and you close around breakeven.”
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Lesson
To trade without wavering, market context and conviction are essential!
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The real reason people leave EAs. Understanding the “logic” is what separates survivors
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After 12 years of discretionary trading, Tokoya worked on EA development. Seeing markets from both the developer and trader perspectives, he noticed a pattern.
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“I think there are broadly two types of EAs: those that aim for big profits in specific market conditions, and those that steadily accumulate gains. Many EAs earned big profits during the USDJPY uptrend from 2022 to 2024, but when the market turned into a downtrend and losses occurred, some users abandoned EAs.”
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Developers can read market changes and stop or switch EA usage. However, users who don’t know the logic have no choice but to give up on the EA itself when losses continue—this is the structure behind people leaving EAs.
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“It’s better to automate with logic you understand, and of course to do discretionary trading only after grasping the logic. Understanding the logic is crucial.”
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Lesson
To stay in the markets long-term, you must understand the logic of the tools you use
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In the second installment, we’ll deliver the full picture of a trading strategy using resistance and support. From applications to discretionary trading to semi-automated EAs, we plan to explain concrete methods in detail. Please look forward to Part 2.
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| Part 1 |
| [Profits equal to a house] The conclusion reached after 17 years of trading | Market context matters more than entries |
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Behind the 17 years and tens of millions of yen in results, there was no glamorous secret. What existed were the steady hours spent building up“systematized rules,” “market context,” “conviction,” and “understanding the logic.”—these four keywords.
In Part 2, as a practical application of that logic, we’ll introduce in detail the“Complete Support-Resistance Flip Mastery System.”recommended by Tokoya.
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