Please exchange rupees to yen in India itself, or bring dollars or euros to Japan and get them exchanged to yen here. You can make payments in Japan using international credit cards, forex cards, traveller's cheques, etc., but some stores and restaurants only accept cash, so you will need cash as well.
There are no upper limits to how much money you can bring into or take out of Japan, but if you take out JPY 1 million or more (including cash, cheques, marketable securities, etc.), you will have to declare it at customs. The Japanese unit of currency is yen (JPY). Yen comes in coins available in denominations of 1 yen, 5 yen, 10 yen, 50 yen, 100 yen, and 500 yen, and notes available in denominations of 1,000 yen, 2,000 yen, 5,000 yen, and 10,000 yen.
Japanese yen can be purchased at banks handling foreign exchange or other currency exchanges at international airports during ordinary working hours. The exchange rate changes every day.
1JPY = 0.576INR 1USD = 64.75INR
Lunch: 1,000–2,000 JPY
Dinner: 2,000–4,000 JPY
Information on service facilities available at Narita Airport (English) https://www.narita-airport.jp/en/service/svc_12
Information on service facilities available at Haneda Airport (English)
ATM service fees may be charged when withdrawing money from an ATM, depending on the hour or day.