Singapore Airline to Haneda already change to 10pm arrived time after Covid. All Foreigners International flight to Haneda only allow arrived at Night.
Morning & Afternoon time are reserved for ANA & JAL for boosting their ticket sales.
If you Take ANA from Singapore to Haneda then you will arrived in morning.

It will be permanently. Before Covid, 70% from outside of Japan are schedule to land at Haneda at 9-11pm. Now 100%
You want good timing at Haneda, you are forced to take JAL & ANA or landed at Narita.
This is how the Good Government do thing. Boost own carrier and Boost Narita Airport income.

Pre-Covid Time, ANA & JAL from KUL & SIN are reaching at 10pm. Now reschedule to 6.30pm!!!!
Mama Mia!!!!

More Expensive abit because need pay travel agency to booked hotel & air ticket & Visa for you.
Preparing black & white travel document.

BTW, I not recommended going Japan this year as tourist due to Japan medic still in collapsing condition. If unlucky, you kena covid, no Hospital / Clinic / Pharmacy will help you. Make sure got Malaysia Embassy contact number in Japan. Seek help when needed.

Japan e hailing price no difference compare to Taxi. Kawaguchiko station sure got taxi standby.
That distant easily will cost you 5000-6000 Yen

Kawaguchiko are very small town, 70% taxi are based at Kawaguchiko Station, 20% are on the road with passenger & 10% was empty car on the way back to Kawaguchiko Station.

If you at Bus stop waiting for taxi then you only got 10% which is no idea how long had to wait, if very lucky maybe less than 10 minute.
More on gambling side.