Yasusada Yamatonokam, the 17th member at the citadel, discovers that he and Kiyomitsu Kashû used to serve the same master, Okita Souji.

Yasusada Yamatonokami and Kiyomitsu Kashû are to take care of two new arrivals at the Citadel. Masakuni Dôdanuki and Kuninaga Tsurumaru have arrived. In addition, three swordsmen are given a mission in Honnôji.

Hirano Toushirou has found a four-leaf clover underneath the big tree; he intends to give it to Uguisumaru, but the task is not so easy.

The cherry tree is in full bloom when Kanesada Izuminokami appears in the citadel; the swords enjoy the cherry blossoms and revel in memories, but problems arise because Jiroutachi is drunk.

The Swords rejoice at the arrival of one of Japan's five great swords; the master makes contact with the group when Munechika Mikazuki appears in the forge room.

Yasusada Yamatonokami and Kiyomitsu Kashû prepare an expedition of discovery to Edo. Shortly before their departure, the master falls ill. On the way, the group must search for medicinal herbs with which they can treat his fever.