Following their parents' move for work, Yuuto and Erika settle into a shared life that quickly evolves into a more personal and affectionate dynamic between them. The art teacher at Yuuto's school picks up on these developments through her student's recent behavior and appearance. Driven by a mix of concern and fascination, she begins to investigate further, potentially disrupting the siblings' newfound closeness. As interactions unfold, the balance of their secret connection faces its first external challenges.
