The word on the street is all about "SeCrew", a popular sex delivery service. Acting on mild curiosity, the protagonist tried ordering from this service, and to his surprise, the person who showed up was none other than Minami Aizawa, a girl from his class!

The mood was awkward at first since they were acquaintances, but with her taking the lead he was able to begin his exciting first time sexual experience.

(Source: DLsite)