Yes, 55house.co.jp can receive emails.
Yes, 55house.co.jp seems to be a legitimate domain.
A record
None
MX records
ampub01.alpha-mail.net
216.230.254.1
ampub02.alpha-mail.net
216.230.254.2
ampub03.alpha-mail.net
216.230.254.3
ampub04.alpha-mail.net
216.230.254.4