Holding hands is generally acceptable, but more overt PDA like kissing or hugging in public is still considered awkward or inappropriate, particularly around older generations or on public transport.
Despite the heavy workload, Japanese teens are a major driving force in global pop culture, specifically through their adoption and export of "cool" aesthetics. japanese teens
Teens in cities like Tokyo enjoy a high degree of independent mobility, frequently traveling across the city alone by train—a level of freedom that surprises many Western visitors. Comparison: Japan vs. The West School Grade and Age Structures in Japan - PLAZA HOMES Holding hands is generally acceptable, but more overt