SSNI-344: Since Mother-in-law passed away. Father-in-law (Sagawa Ginji) moved to live with the son (Hirata Tsukasa) and with Yua Mikami. The son has not been very interested in Yua lately, as he is having an affair, the married couple has not had sex for well over a year, and Yua frustration is mounting up. At the same Sagawa Ginji is becoming an old man, with no female company and frustrated as well. Evolving into a mad-man genius with a gift from nature: a tongue that can tell anything by them taste. The Father-in-law then start to move very aggressively on Yua, when he discovers her frustrations. Using his skilled tongue to drive Yua insane. It’s all the tongue.