Currently, Japan aims to realize an avatar-symbiotic society where everyone can freely thrive by the year 2050. This goal is not an exception for criminal proceedings; the concept of criminal procedure will be significantly overturned by utilizing avatars. Therefore, this report examines the prospects and challenges of criminal procedure law in an avatar-symbiotic society, considering specific cases. This work was supported by JST Moonshot R&D Grant Number JPMJMS2215.