Sell faster on Mercari & Yahoo Furima using AI-written listings

Community tip · Practical routine

Prices are up and the yen is weak — a lot of us in Japan are looking for extra income wherever we can find it, and selling pre-loved items (Mercari, Yahoo! Furima, Rakuma, Facebook Marketplace) is one of the easiest starting points. Here's a simple routine using AI to write listing descriptions that actually convert.

物価高・円安の今、メルカリ等での不用品販売は始めやすい副収入源です。AIを使った出品文の作り方を紹介します。

1. Photograph the item properly

Upload 10–20 photos to an AI tool (Google AI Studio and similar work well). Even scratches, wear, and worn edges are fine — the more detail visible, the better the AI can describe it honestly.

2. Use a clear Japanese prompt

A prompt like this works well for Mercari, Yahoo Furima, and Rakuma listings:

3. Let it suggest photo angles too

A good AI pass will also tell you what to photograph next — brand label close-ups, depth of pockets or compartments, premium-looking angles, lighting. Better photos mean more likes and faster sales.

4. What to expect

This won't turn junk into gold, but a well-written, honest description with good photos genuinely moves faster than a one-line listing. One small example: I once listed a baseball glove that had been given to me for free, using this exact routine — describing the leather condition, the pocket depth, even how it "sounded" when caught. It sold for ¥5,980. Not life-changing money, but it was a glove I paid nothing for.

It's also worth learning to spot "human error" pricing at secondhand shops like Second Street, Off House, and TreFac — items priced low simply because staff didn't catch their resale value. I think of this as a kind of "smart buying literacy": learning to notice when a price tag doesn't match what something is actually worth.

セカンドストリート・オフハウス・トレファクなどでは、値付けミス(人的ミス)の掘り出し物が見つかることもあります。