Eiko Tsukimi is a young woman from Kyoto with a complex family background. Her musician father left for the United States, creating estrangement between Eiko and her mother, who opposed Eiko's connection to music. This strain led Eiko to contemplate suicide during a high school trip to Shibuya. Kobayashi, owner of the BB Lounge nightclub, rescued her. He took her to see American singer Maria Diezel perform; hearing the song "I'm still alive today" reignited Eiko's will to live and inspired her musical aspirations. She began working at BB Lounge as a resident singer and store clerk, but was nearing the point of abandoning her dreams due to limited success, evidenced by only 208 social media followers. Her path shifted dramatically after encountering Zhuge Kongming at a Halloween event. Mistaking her oni costume for a "Songstress of Hell," he became her strategist after being impressed by her singing upon hearing her perform three times. Kongming applied historical military tactics to advance her music career, leading to the formation of the record label "Fourth Kingdom," where Eiko serves as the main singer. Her stated goal is performing at Voicell Land, the world's largest music festival in Belgium. Eiko stands 164.5 cm tall and has long blonde hair typically styled in twin braids. Her wardrobe reflects a casual, streetwear aesthetic, featuring varied outfits such as tricolored track jackets, oversized tops, shorts, sneakers, and ballcaps. Specific attire includes an oni Halloween costume (a black dress with red lace), jogging outfits, festival concert tracksuits, winter quilted jackets, and performance wear like pink hoodies or denim jackets during street shows. Key relationships define her journey: Kongming serves as her mentor and manager, their dynamic echoing the historical bond between Kongming and Liu Bei. Kobayashi is a father figure who provided sanctuary at BB Lounge. She befriended rapper Kabetaijin after supporting his return to music and formed a bond with Nanami Kuon, vocalist of the band Azalea, after aiding her during an unauthorized street performance. Their collaboration helped both reignite their musical passions. Eiko's surname "Tsukimi" (月見) means "moon viewing," and her given name "Eiko" (英子) combines "excellent" (英) and "child" (子). Her full name references Huang Yueying, Kongming's wife in historical accounts, though her narrative role more closely parallels Liu Bei, Kongming's former lord who sought his guidance after repeated setbacks. This mirrors Eiko's journey, as she was close to abandoning her dreams before meeting Kongming.