The film delicately portrays a young girl who struggles with the sudden discovery of juvenile breast cancer and her complicated relationship with her mother.
You can now watch The Lump in my Heart online on the following streaming providers in the United States.
| Directing | Shingo Matsumura | Director |
| Writing | Izumi Takahashi | Writer |
| Production | Rii Ishihara | Producer |
| Production | Shingo Matsumura | Producer |
| Production | Ryusei Emi | Producer |
| Camera | Seiya Uehara | Director of Photography |