Thank you for sharing your dream. Dreams can often reflect our subconscious thoughts, emotions, and experiences. Here are some insights and interpretations based on the various elements of your dream:

1. Cultural Experience and Communication Barriers: Dreaming about being in a gym in Japan where you struggle to communicate may symbolize your feelings of being out of place or facing obstacles in your current environment. It could reflect anxieties about adapting to new situations or cultures, especially if you’re in a foreign country.
2. Help and Support: The interactions with the gym staff, particularly the manager and the worker, might represent your desire for support and understanding in navigating unfamiliar circumstances. The hesitation of the worker to assist you might reflect feelings of being misunderstood or unsupported in real life.
3. Childhood and Nostalgia: The presence of toys and elements reminiscent of your childhood suggests a longing for simpler times or comfort. This may indicate a need to reconnect with your inner child or to find joy and playfulness amidst challenges.
4. Connections and Relationships: The appearance of your cousin and the conversation about zodiac signs may signify your thoughts about relationships and connections with others. The transformation of your cousin into someone unknown might indicate feelings of change or uncertainty in your personal relationships.
5. Military Themes: The presence of military uniforms and the character’s connection to military life may reflect discipline, duty, or protection. It could symbolize your own experiences or feelings related to responsibility, security, or perhaps unresolved emotions regarding loved ones in the military.
6. Emotional Intensity and Farewells: The hugging scene and the intensity of the emotions you felt suggest a deep connection with someone or something in your life that is significant to you. The warmth and love you experienced in the hug could symbolize your longing for emotional closeness or the fear of losing someone dear to you.
7. Empathy and Pain: The moment with the puppy and the feelings of pain may reflect your sensitivity and empathy towards others' suffering. It might indicate a struggle with feelings of helplessness when witnessing pain, either in others or in situations around you.

Overall, this dream seems to be a rich tapestry of your experiences, emotions, and relationships. It may be beneficial to reflect on any current challenges or feelings of nostalgia you are experiencing in your waking life. Consider how these themes resonate with you and whether there are aspects you’d like to address or explore further in your life.