25-sai no Joshikousei: Kodomo ni wa Oshierarenai Koto Shiteyaru yo  

25歳の女子高生～子供には教えられないことシてやるよ, 25-Year-Old High School Girl: I'll Do What Can't Be Taught to Children

On her first day back at school, 25-year-old hana natori is excited to begin. however, she's not a high school student like the girl whose name she shares; instead, she's filling in for the real kaho miyoshis absence due to her regular absences. despite their similar appearance, hana struggles to relate to high school students and finds herself overwhelmed by the new environment. while attempting to excuse herself from class to visit the nurse, hana is confronted by an acquaintance of kaho who wants her to have a good time. however, before things escalate, she's saved by okito kanie, a teacher and former classmate of hanas, who recognizes her and demands that she end her charade. when hana refuses, okito threatens to expose her secret unless she pays him with her body.

25-sai no Joshikousei: Kodomo ni wa Oshierarenai Koto Shiteyaru yo has been published digitally in English as 25-Year-Old High School Girl, I Wouldn't Do This with a Kid by WWWave Corporation through Coolmic.