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This protocol outlines a cluster, parallel-group, exploratory, randomized controlled trial where participants are randomly allocated to one of the two groups: intervention or control.

• The main objective is to implement and assess the effectiveness of the program for combating bullying through virtual reality. The program aims to reduce victimization and bullying behaviors (physical, verbal, and relational aggression) by applying the APRI tool as a result of participating in VR scenarios that simulate these situations and to reduce emotional difficulties and behavioral problems, as well as increase prosocial behavior.
• The included classes will serve as the randomization units. Students aged between 10 and 14 years, (5th and 6th grades from middle schools) will participate in the study. The intervention will last 7 weeks, and the two groups will be assessed at (1) pre-intervention (baseline), (2) middle of the intervention (week 3 or 4), and (3) post-intervention. The data analysis will focus on improvement in outcomes between and within groups.

Inclusion criteria

• Students 5th and 6th grade
• Students whose parents have given their consent and who have also agreed to participate in the program

Exclusion criteria

• Medical problems that have VR-based procedures as contraindicated because they can induce dizziness, seizures, nausea:

• epilepsy
• presence of seizures
• severe motion sickness- vestibular disorders
• significant vision problems that would interfere with the use of the headset
• severe migraines triggered by exposure to screens
• Neurodevelopmental disorders

• Autism spectrum disorder- level 3 of severity or sensory processing disorders
• ADHD, if hyperactivity would prevent the student from staying in the exercise for longer
• Points a) and b) do not represent automatic exclusion criteria, because depending on the judgment of the school counselor, the parent and the teacher, it is possible that a participant will be able to complete the program.
• Severe mental disorders: psychotic spectrum disorders, post-traumatic stress disorder, present suicidal ideation
• If children have an extremely low level of literacy perceived by the teacher and counselor, and this aspect would prevent them from participating in the program.
• Parallel participation in other bullying prevention programs.