Connecting and adjoining rooms
Larger international hotels around Umeda are the most likely to offer connecting or adjoining rooms on request, letting a group split across two standard rooms while staying next to each other — worth requesting directly with the hotel rather than assuming a booking platform will surface this option automatically.
Vacation rentals for groups
A larger registered vacation rental or a whole-house machiya often works out more practical and more affordable per person than multiple hotel rooms for a group of six or more, with the added benefit of a shared living space and kitchen.
Splitting across nearby hotels
If a single property with enough capacity isn't available, booking two hotels within the same neighbourhood — rather than assuming everyone needs to be under one roof — is a realistic fallback given how walkable central Osaka is.