Can three people traveling with a group in Japan stay in a double room?

the experience of staying in Japan for so many years tells you that you can.

because it is strange in Japan that it is not charged by room, but by person.

so tell him it's two people when you move in. Two single beds, please.

two people can sleep in the same bed then.

if you are not very fat, you can sleep.

I hope I can help you.

hope to adopt it.