Shiranai Koto Shiritai no? The Animation

The protagonist takes over his grandfather's plastic model shop after the old man falls ill. A regular customer, the busty plastic model otaku Risa, joins as a part-timer. Thanks to her strict but reliable help, the shop reopens smoothly.

One day, the protagonist discovers a solvent his grandfather made. After work, Risa starts changing without protection, and he accidentally spills the solvent on her body. As he panics, Risa's mood shifts, becoming more sensual. Her body throbbing, she begs him to calm her down.