Kōshi was made to swallow a ball of poison from the Tenga clan and was told that in a week he will die unless he is given an antidote. Momoko willingly swallows the same poison so that if Kōshi dies, she does as well. Momoko and the other martial artists on their side train for a week, and Kōshi tries to learn a technique of his own, but fails. Kōshi and the others then go to the Tenga clan's main house and must fight several battles to gain the antidote.
毒の丸薬を飲み込んでしまった孝士に「解毒剤が欲しければ力ずくで取りに来い」と言い捨て、天々達は虎金井の村へ帰っていく。解毒剤を飲まなければ余命一週間とい厳しいう現実。解毒剤を奪回しようと半蔵達は意気込むが「お前らが勝てる相手じゃない」と孝士は拒絶し、もも子にも「全部お前のせいだ」と言ってしまう。もも子はその言葉を聞き、黙って残っていた丸薬に手を伸ばし飲み込んでしまう。
