The Brightest Roof in the Universe (2020)

Fourteen-year-old schoolgirl Tsubame is into university student Toru. She seems him in her area and really wants to be his. She struggles with how to inform him of her love. Then her stepmother becomes pregnant and she is distracted with that development. The one reliable part of her life is the calligraphy class she attends, but then she runs into a woman.