The film's portrayal of LGBTQ+ characters and themes could not be assessed as no relevant content was identified from the provided information. Therefore, the net impact is considered N/A due to the absence of depiction.

This film does not appear to feature identifiable transsexual characters or themes. Consequently, there is no specific portrayal of transgender identity to evaluate within the narrative.

The movie does not contain any action or adventure elements.

The 1958 film "十代の恋よさようなら" appears to be an original production or an adaptation that maintains character genders from its source material. There is no evidence of any character being portrayed with a different gender than their established canonical or historical identity.

The film "Teenage Love, Goodbye" is a 1958 movie without specified source material or prior character canon. Therefore, there are no established character races to compare against the on-screen portrayals, and no race swap can be identified.