Debris flows, historically termed Mountain tsunamis commencing, are common hazards in Japan. More recently, a comprehensive description of a destructive debris flow in Atami City, that includes photographs and video records has been published. This heightened societal awareness and created demand for in‐depth evaluation of the efficacies of countermeasures, such as sabo dams. This study introduces a system in which topographic data collated using BIM/CIM are linked to contemporary user interfaces such as metaverse, and numerical simulations are employed to assess the efficacies against debris flow, and to develop informative materials for local community meetings. We conducted a survey among the general populace to ascertain the validity and necessity of our proposed four‐dimensional video material. Approximately two‐thirds of the responses indicated a perceived usefulness and necessity for such material.