This is the classic small, daily decision where "it's only a few hundred yen" quietly adds up to a serious number. Mio doesn't do guilt — just the math, so you can decide on purpose instead of by default.
There's a real reason foreign residents lean on convenience stores at first, and it isn't laziness. Konbini are open 24 hours, they're everywhere, the products are labeled clearly with prices, and the checkout is fast and low-stakes — no membership card, no bagging etiquette to learn, and increasingly English-friendly screens and staff. When you've just arrived and can't read every label in a supermarket, the konbini is the path of least resistance. That convenience is genuinely worth something. The problem is only when the default becomes every day.
A typical konbini lunch — an onigiri or two, or a bento, plus a bottled drink or coffee — often lands around ¥700–900 (illustrative; varies by what you grab). The same rough meal built from a supermarket, or a bento made at home from supermarket ingredients, is more like ¥300–450. The per-item difference feels trivial. It's the repetition that isn't.
| Assumption | Value |
|---|---|
| Konbini lunch + drink (per day) | ¥800 |
| Supermarket / home bento (per day) | ¥400 |
| Daily gap | ¥400 |
| Workdays per year | ~250 |
| Yearly difference | ¥400 × 250 ≈ ¥100,000 / year |
So a daily konbini lunch habit costs roughly ¥100,000 a year more than the supermarket version — illustrative, but in the right ballpark. Add a daily konbini coffee or afternoon snack on top and the gap widens further. Cut it to just the days you actually need the convenience, and most of that number comes back to you.
Here's the supermarket edge newcomers miss entirely: in the evening, supermarkets slap discount stickers on fresh food that won't keep — bento, sushi, deli sides, bread. Look for 半額 (hangaku, "half price") or ◯円引き / ◯% OFF stickers, usually from late afternoon into closing time. A ¥500 bento at 半額 is ¥250. Konbini rarely discounts like this. If you time a supermarket run for the evening markdowns, the yearly gap above gets even bigger in your favor.
Mio isn't telling you to never enter a 7-Eleven. Konbini buy you time and certainty — a hot meal at 2am, a working ATM, bill payments, package pickup, an umbrella when it's raining. That's real value. The mistake isn't using konbini; it's using them on autopilot for things a supermarket does far cheaper — your daily rice, drinks, snacks, and staples.
Smart split: buy staples and everyday food from the supermarket (in one weekly-ish trip), and keep the konbini for genuine convenience — the late nights, the emergencies, the times the ¥300 premium actually buys you something. That way you pay the convenience price only when you're getting the convenience.
Supermarket for the daily default; konbini when convenience is the point. The konbini habit isn't a character flaw — it's just an un-priced meter running in the background. Once you can see the ~¥100,000/year figure, the choice becomes a decision instead of a reflex. Pay for convenience on purpose, not by accident.