Until Japan opens it's borders, no overnight connections in NRT. Verbiage from JAL email I got 2 days ago, see below:

■Notice: For Passengers with International Flight Connections/Transfers in Japan
Travelers who are directly transiting to a third country via Japan are not required to submit documents or undergo PCR testing for Japan.
However, the following itineraries are considered “Entry into Japan” and foreign nationals arriving from prohibited countries will not be allowed to enter the country.
Please review your itinerary carefully and contact your travel agent or JAL Reservations to make changes, if necessary.

Itineraries considered “Entry into Japan”:
　・Routing including a transfer between Tokyo-Haneda Int’l Airport (HND) and Narita Int’l Airport (NRT)
　・Routing with a connecting flight at Narita Int’l Airport (NRT) the following day
Additionally, for passengers transiting via Japan, please refer to the Entry Restrictions for each country and related information on Quarantine Measures.