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The number of internet users in Japan has exceeded 100 million and continues to grow.
They can connect to the internet anytime and anywhere.
Background: As the number of internet users increases, problems related to internet overuse are becoming more and more serious.
Adolescents and youth may be particularly attracted to and preoccupied with various online activities.
As the number of internet users increases, problematic internet use, or internet addiction, has been rising as well.
The term internet addiction has been used frequently and casually to describe individuals with severe internet overuse or problematic internet use (2–5).