2.5D Stage Play

2.5D Stage Play (2.5次元舞台) is the fifth arc of Oshi no Ko manga series. It spans the fifth, sixth, and the first six chapters of the seventh volume of Oshi no Ko. It covers the preparation and rehearsals for the stage play adaptation of a famous manga, "Tokyo Blade", originally written by mangaka Abiko Samejima and adapted by Goa, and the opening night of the play.

Rehearsals

 * Chapter 41: Staff Meeting (顔合わせ)
 * Chapter 42: Read-Through (読み合わせ)
 * Chapter 43: Losing Heroine (負けヒロイン)
 * Chapter 44: Observation (見学)
 * Chapter 45: Telephone Game (伝言ゲーム)
 * Chapter 46: Stage (箱)
 * Chapter 47: Visiting Her Workplace (職場訪問)
 * Chapter 48: Crunch Time (修羅場)
 * Chapter 49: Rewriting (リライティング)
 * Chapter 50: Emotional Acting (感情演技)
 * Chapter 51: Inquiry (考察)
 * Chapter 52: Boyfriend, Girlfriend (カレシカノジョ)
 * Chapter 53: Playboy (軟派)
 * Chapter 54: Axis of a Conflict (対立軸)

Opening Night

 * Chapter 55: Opening (開幕)
 * Chapter 56: Beginning of Competition (緒戦)
 * Chapter 57: Lousy (ヘタクソ)
 * Chapter 58: Growth (成長)
 * Chapter 59: Admiration (憧れ)
 * Chapter 60: The Sun (太陽)
 * Chapter 61: Play Along (受け)
 * Chapter 62: Ad-lib (アドリブ)
 * Chapter 63: Genius Actor (天才役者)
 * Chapter 64: Trigger (トリガー)
 * Chapter 65: Regret (後悔)
 * Chapter 66: The Curtain Falls (閉幕)

Characters

 * Aquamarine Hoshino
 * Kana Arima
 * Akane Kurokawa
 * Melt Narushima
 * Ruby Hoshino
 * Minami Kotobuki
 * Frill Shiranui

Introduced

 * Toshirou Kindaichi
 * Goa
 * Taiki Himekawa
 * Sakuya Kamoshida
 * Abiko Samejima
 * Mita Norio
 * Mei Adashino
 * Koyuki Yoshidomi
 * Kiiro Hayashibara
 * Funato Ryouma

Trivia

 * This is the longest arc of Oshi no Ko so far, covering 26 chapters and spanning across three different volumes.