Sashita-San, My Human Drawing Mannequin

After school in the art room, alone with the class heroine, Sashita-san. And she's in a swimsuit—!?
On a rainy day after school, Tsukishima was stuck on a drawing in the art room when Sashita-san, the track team ace and class favorite, appeared. Just sitting there, she looked “picture-perfect.” Unable to control his impulse, Tsukishima declared, “I'm drawing you now!” and started sketching her, somewhat forcefully. Though confused, Sashita-san felt her heart race under his serious gaze.
“Raise your arm. I need to know the proportions. Quickly.” — As she followed Tsukishima's forceful instructions for the sake of the drawing, the usually cheerful girl gradually took on an ecstatic expression, transforming into something like a “sketch model” just for Tsukishima...!?
Amidst the sound of rain, my secret relationship with Sashida-san begins now!!