Yajirou Shimogamo, second son of the late tanuki leader Souichirou Shimogamo, harbors profound guilt over his father's demise. This stems from a night of heavy drinking where he transformed into a train to carry his inebriated father through Kyoto. Souichirou disembarked alone, was captured by the Friday Fellows, and killed. This tragedy pushed Yajirou across a "Despair Event Horizon," leading to self-imposed exile as a frog at the bottom of a well. Prolonged isolation in this frog form caused Yajirou to lose the ability to revert to tanuki or human shapes, experiencing a shapeshifter mode lock. He adopted a passive existence, calling himself "a frog in a well" and consistently downplaying his insights. Despite this, he gained a reputation as a listener; visitors shared their troubles, and he offered philosophical reflections attributed to nightly stargazing, yet he always dismissed his own wisdom. Yajirou's character arc involves grappling with unrequited love for Kaisei Ebisugawa, his younger brother Yasaburo's former fiancée. This emotional burden compounded his guilt and withdrawal. He also exhibits "Middle Child Syndrome," feeling overshadowed by his siblings despite his mother's unwavering support. A pivotal development occurred when his youngest brother, Yashiro, poured Electric Brandy into the well. The alcohol reactivated Yajirou's transformative abilities, allowing him to temporarily become a green trolley-train. In this form, he rescued his brothers from the Friday Fellows and the Ebisugawa family, rampaging through Kyoto before crashing. This act signified a partial reconnection with his "idiot blood," a familial trait of reckless whimsy inherited from his father. Later, Yajirou's human form reappeared sporadically, particularly during crises involving Kaisei or his family. He continued to struggle with self-blame but gradually began participating in family matters, indicating slow emotional healing. His ability to objectively analyze others' problems remained consistent, often leading to crucial revelations for the Shimogamo family.