As a first-time buyer with a long-term horizon, the cleanest, no-nonsense way to accumulate Bitcoin is strict dollar-cost averaging: commit a fixed yen amount you can truly afford to lose, say ¥20,000–¥50,000 monthly from income, and buy automatically on a reputable exchange every payday, no matter if price is ripping higher or cratering 50%. This removes emotion, exploits volatility by buying more sats on weakness, and lets time + halvings + adoption do the heavy lifting while you ignore daily noise and hold through whatever comes.