Echiechi Therapy ~Ore no Idenshi o Nokosu Tame, Kodukuri Renshuu Hajimarimashita!~

A lonely otaku named Mobuo receives an unexpected visit from Serara, a beautiful alien girl from the planet Ndasiana. Serara claims that Mobuo possesses a super rare genetic trait known as "Happy Happy DNA." To save her home planet, she declares that she has come to help him practice making babies. The two subsequently engage in sexual intercourse to fulfill this mission. Ultimately, the story concludes with a glimpse into the future, revealing that Mobuo and Serara have successfully raised a large family together.