A possible cleaned-up version could be:
"Doujin desu. T V jogakkou de otoko hitori nanodesu ga, fixed."
Which roughly means:
"It's a doujin. At T.V. girls' school, I'm the only boy, but... fixed."

B. Easy Character Archetypes

The girls can be slotted into classic types: the shy class rep, the aggressive athlete, the mysterious loner, the bubbly junior. The boy reacts differently to each, creating multiple romantic or erotic subplots.

"Doujin desu. TV jogakkou de otoko hitori nanoda."
("It's a doujin. It's that there's only one guy at a girls' school on TV.")

The room gasped.

1. タイトルの印象と語感

「女子校で男一人」という設定は、一種のズレや違和感を演出します。ジェンダー的な非対称性、場の文化的文脈と個人の孤立、そしてコミカルに誇張された状況設定は、笑いを誘いつつも観察的な視点を提供します。語尾の「なのだ」は口語的で親しみやすく、少し生意気で愛嬌のあるトーンを添えます。