With Risa the tsundere big-breasted sales clerk off work and no customers in the plastic model shop, the protagonist passes time watching videos of busty streamer Tsukishima Misaki. While remembering the sex he had with Risa the other day, Risa herself suddenly enters the store. Despite realizing he was watching her videos, Tsukishima Misaki kindly but provocatively teaches him about plastic models. However, the mysterious solvent created by his grandfather activates again, causing the protagonist to lose control and pounce on Tsukishima-san, leading to intense sex with deepthroat, paizuri, raw pounding, and creampie overload