These words come up in Lesson 5: Paying at the Register and Shopping Manners 4: Payment & Returns.
レジ (reji)
Meaning: Register / checkout counter.
Example: レジはあちらです。
Reji wa achira desu.
"The register is over there." (what staff will say)
Usage: From English "register"; the counter where you pay.
お会計 (o-kaikei)
Meaning: The bill / checkout, polite form.
Example: お会計、お願いします。
O-kaikei, onegai shimasu.
"Checkout, please."
Usage: The key phrase from Lesson 5 — the polite way to ask to pay.
現金 (genkin)
Meaning: Cash.
Example: 現金のみ対応しております。
Genkin nomi taiō shite orimasu.
"We only accept cash." (polite staff phrasing)
Usage: Many small otaku-goods shops and gacha machines are cash-only — always carry some yen.
税込 (zeikomi)
Meaning: Tax included.
Example: この値段は税込ですか？
Kono nedan wa zeikomi desu ka?
"Is this price tax-included?"
Usage: The opposite is 税抜 (zeinuki, "before tax"); Japanese price tags almost always show 税込 prices today.
お釣り (o-tsuri)
Meaning: Change (money given back).
Example: お釣りをどうぞ。
O-tsuri o dōzo.
"Here's your change." (what staff will say)
Usage: Said by staff when handing back change; you can simply reply ありがとうございます.
Quick Check
Q1. What is レジ (reji)?
A. The checkout register/counter.
Q2. What do you say to ask to pay your bill?
A. お会計、お願いします (O-kaikei, onegai shimasu).
Q3. What does 現金のみ (genkin nomi) mean on a shop sign?
A. "Cash only."
Q4. What does 税込 (zeikomi) mean on a price tag?
A. "Tax included in this price."
Q5. What is お釣り (o-tsuri)?
A. Change — money handed back after payment.