Onii-chan wa Oshimai!

按本作已核实的具体关系或设定事实应用现行评级类别。 The central premise is male-to-female bodily sex change/gender-bender, not proof that Mahiro identifies as a transgender woman and not an original all-female GL setup. No central romance is established by the official overview. 剧情依据：Adult male shut-in Mahiro is chemically transformed into a female body by his sister without prior informed consent and begins living socially as a girl, including school and female-only facilities. 结局范围：The television anime has a completed twelve-episode season; the transformation’s permanent or final identity outcome is not resolved by the overview. 男性关系：mahiro_is_explicitly_an_adult_male_former_older_brother_before_drug_induced_female_body_change 关系背叛：no_ntr_fact_established 亲密内容：erotic-game references, body-change comedy, bathing, underwear, and puberty/body functions are explicit themes; exact fanservice requires episode review 参与者：adult male identity in female body presented among school-age girls; no central sexual relationship established 年龄与同意：adult consciousness/identity is placed in a school-age female presentation and school environment; requires careful age-context review 强迫与控制：sister_secretly_drugs_mahiro_and_changes_his_body_without_prior_informed_consent 暴力与恐怖：no major violence established; involuntary medical/bodily alteration is central 待补证：Verify the final episode’s choice, whether Mahiro ever self-identifies as transgender, and any romance or sexualization involving school-age presentation. 基于既有研究资料作出的 AI 评级；未重新抓取外部资料。未知项不表示安全或不存在。