  This paper contributes to building a standard process of research and
development (R&D) for new user experiences (UX) in metaverse services. We
tested this R&D process on a new UX proof of concept (PoC) for Meta Quest
head-mounted display (HMDs) consisting of a school-life karaoke experience with
the hypothesis that it is possible to design the avatars with only the
necessary functions and rendering costs. The school life metaverse is a
relevant subject for discovering issues and problems in this type of
simultaneous connection. To qualitatively evaluate the potential of a
multi-person metaverse experience, this study investigated subjects where each
avatar requires expressive skills. While avatar play experiences feature
artistic expressions, such as dancing, playing musical instruments, and
drawing, and these can be used to evaluate their operability and expressive
capabilities qualitatively, the Quest's tracking capabilities are insufficient
for full-body performance and graphical art expression. Considering such
hardware limitations, this study evaluated the Quest, focusing primarily on UX
simplicity using AI Fusion techniques and expressiveness in instrumental scenes
played by approximately four avatars. This research reported methods for
multiuser metaverse communication and its supporting technologies, such as
head-mounted devices and their graphics performance, special interaction
techniques, and complementary tools and the importance of PoC development, its
evaluation, and its iterations. The result is remarkable for further research;
these expressive technologies in a multi-user context are directly related to
the quality of communication within the metaverse and the value of the
user-generated content (UGC) produced there.
