Yoshiko Tsushima
Yoshiko Tsushima is a Japanese school idol associated with Aqours, the school idol club of Uranohoshi Girls' High School in Numazu, Shizuoka Prefecture. Born on 13 July, she entered Uranohoshi as a first-year student and participated in the club during its campaign to prevent the school’s closure. Her public identity combined ordinary student life with the persona “Yohane,” a self-described fallen angel whose followers were designated “little demons.”
Tsushima’s adoption of a supernatural stage identity shaped her entry into organized school-idol activity, her relations with other members of Aqours, and her performance style. The resulting distinction between Yoshiko and Yohane was not maintained as a complete separation of identities. Instead, the two names marked different modes of self-presentation used within the same social and institutional setting.
Early life and education
Tsushima grew up in Numazu and attended the same elementary school as Hanamaru Kunikida. During childhood, she developed an elaborate fallen-angel persona organized around invented angelology, ritualized gestures, and the attribution of ordinary misfortune to cosmic causes. Kunikida remained familiar with this behavior after the two entered different phases of their education.
Upon enrolling at Uranohoshi, Tsushima attempted to suppress the Yohane persona and establish a conventional secondary-school identity. The attempt ended during her classroom introduction, when she reverted to the speech and gestures associated with Yohane. Her embarrassment led to a period of withdrawal from regular attendance, which reinforced the practical difficulty of separating the persona from her daily conduct.
Kunikida re-established contact with Tsushima during this period. Their interaction placed Tsushima within the first-year peer group that also included Ruby Kurosawa. This connection subsequently provided the immediate social context for her contact with Aqours.
The Yohane persona
Yohane was presented as a fallen angel expelled from heaven and compelled to live in the human world. Within this framework, adverse events were interpreted as consequences of supernatural misfortune, while supporters were incorporated into the narrative as little demons. The persona included a specialized vocabulary and a distinctive vocal register, together with poses derived from occult and fantasy imagery.
The identity corresponds to chūnibyō, a mode of adolescent self-dramatization in which invented powers or exceptional origins are treated as elements of everyday behavior. Tsushima’s case differed from a temporary private fantasy because the persona became a reproducible public performance. Online broadcasting allowed her to address an audience as Yohane, while school-idol activity converted the same material into choreography, costume design, and concert interaction.
Her use of “Yoshiko” and “Yohane” remained context-sensitive. She objected when acquaintances corrected Yohane to her legal given name, yet she continued to respond within ordinary school relationships as Tsushima. The distinction therefore operated less as a claim to two independent persons than as a recurring negotiation between institutional identity and theatrical identity.
Entry into Aqours
Aqours began under the leadership of Chika Takami, who organized the group in response to Uranohoshi’s declining enrollment and proposed closure. Riko Sakurauchi supplied musical expertise during the group’s early development, while You Watanabe participated as a founding performer and contributed to costume production. Their activities established the organizational structure that Tsushima later entered.
Tsushima first became directly relevant to the group through her online use of the Yohane persona. Takami recognized that its established audience and visual vocabulary could be adapted to school-idol performance. Tsushima consequently assisted Aqours with a fallen-angel-themed presentation intended to distinguish the group within the wider field of school idols.
The initial collaboration treated Yohane primarily as a promotional concept. It produced short-term attention but did not provide a stable basis for the group’s identity, since the other members had not developed their performances around the same characterization. Tsushima interpreted the result as evidence that her participation was incompatible with ordinary school life and attempted to withdraw from the project.
Aqours instead incorporated her existing self-presentation without requiring its elimination. Kunikida and Kurosawa joined during the same general phase of the club’s expansion, giving Tsushima a peer group within the organization rather than an isolated thematic function. Her admission marked the transition of Yohane from an external promotional device to one component of Aqours’ collective performance language.
The club later attained its nine-member form with the participation of Dia Kurosawa, Kanan Matsuura, and Mari Ohara. This structure brought together students from all three school years and connected the newer group with an earlier, unsuccessful attempt by the third-year students to form a school-idol unit.
Role within the group
Tsushima functioned as a vocalist and dancer within Aqours. Her stage conduct preserved the gestures and terminology of Yohane, particularly during introductions and audience exchanges. These features differentiated her individual presentation without altering the formal equality of the nine-member ensemble.
The group’s internal division of labor placed her persona alongside other members’ established competencies and interests. Sakurauchi’s musical work contributed to composition and arrangement, while Watanabe’s experience with clothing construction supported the development of performance costumes. Tsushima’s contribution operated principally at the level of characterization, where she supplied a coherent set of symbols that could be incorporated into visual staging and spoken performance.
Her relationship with the audience retained the little-demon terminology developed before she joined Aqours. Within concerts, the term functioned as a participatory designation rather than a separate membership category. This usage integrated an individual fan address into the broader conventions of idol-audience interaction.
Guilty Kiss
Tsushima was also a member of Guilty Kiss, an Aqours subunit formed with Sakurauchi and Ohara. The subunit’s dramatic musical style accommodated the darker visual and verbal elements associated with Yohane more directly than the full group’s broader repertoire.
Within Guilty Kiss, Tsushima’s characterization did not require the other members to adopt her angelological narrative. Instead, the subunit aligned three distinct performance identities through a shared emphasis on theatrical intensity. Sakurauchi’s restrained public demeanor contrasted with Tsushima’s overt dramatization, while Ohara’s extroverted presentation supplied a further mode of stage interaction.
Interpretation
Tsushima’s school-idol career institutionalized a form of self-presentation that had previously disrupted her participation in ordinary school life. The same behavior produced embarrassment when introduced without a supportive context, but became functional when incorporated into a collaborative performance system. Aqours did not resolve the tension between Yoshiko and Yohane by selecting one identity as authentic. It treated the tension itself as durable performance material.
Her development also illustrates the reciprocal relationship between individual characterization and group identity. Yohane gave Aqours access to a distinctive visual and rhetorical vocabulary, while membership in Aqours provided a stable social setting in which Tsushima could use that vocabulary without withdrawing from her classmates. The result was neither complete normalization nor unrestricted private fantasy, but a public role governed by rehearsal, collective decision-making, and the institutional schedule of a school club.