Tomona's Father earned his living as a fisherman and relic hunter, diving into the waters of Dan-no-ura to recover artifacts from sunken Heike warships. He accepted a contract from Ashikaga shogunate agents to retrieve a specific sealed box believed to hold the lost Imperial Regalia: the sacred sword Kusanagi-no-Tsurugi. During the mission, he located the box and extracted the sword. Ignoring warnings, he unsheathed the blade, triggering a supernatural reaction. A surge of energy erupted from the sword, bisecting him and causing instantaneous death. This event simultaneously blinded his son, Tomona, who witnessed it. After death, his spirit remained tethered to the world, manifesting as a ghost visible only to his blinded son. This ghost persistently demanded Tomona seek answers about the incident and pursue vengeance against those who commissioned the fatal dive. He expressed frustration and disapproval when Tomona joined a guild of blind biwa players and adopted the name "Tomoichi," as the change hindered the ghost's ability to locate or communicate with his son. His violent death, caused directly by interacting with the cursed Heike relic, catalyzed Tomona's journey and eventual entanglement with spirits of fallen Heike warriors. The ghost represented Tomona's unresolved trauma and the lingering consequences of the shogunate's political schemes. His spectral existence underscored themes of unrest and the burden of history carried by subsequent generations.