Ryosuke Sugano

"It's a secret~"
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Ryosuke Sugano
Biographical Information
Name	Ryosuke Sugano
Kanji Name	菅野 (すがの) 良 (りょう) 介 (すけ)
Rōmaji Name	Sugano Ryōsuke
Gender	Male
Age	22 (Chapter 9)
Status
Status	Deceased
Occupation	College student
Relationships	Fuyuko Niino (Ex-girlfriend)
First Appearances
Manga	Chapter 1
Anime	Episode 1
Portrayal
Japanese VA	Atsushi Tamaru
English VA	Gabriel Regojo
Live Action	Kazuto Mokudai

“	"You liar... popping out brats... Why?... You tricked me..."	„
― Ryosuke Sugano

Ryosuke Sugano「菅野 (すがの) 良 (りょう) 介 (すけ) , Sugano Ryōsuke^?」 was a pivotal antagonist in Oshi no Ko. He was an obsessive fan of Ai Hoshino, whom he murdered after learning that she had children, before committing suicide to avoid arrest. Prior to this, he also killed Gorou Amamiya when the doctor interfered in his attempt to kill Ai before she gave birth.

Spoilers Ahead!

It is later revealed that he was in a relationship with one of Ai's co-stars. He was also acquinted with Ai's ex-boyfriend, who took advantage of his obsessiveness to get him to her. However, he took it too far and killed Ai, which was not her former lover's intention.

Appearance

Ryosuke with his hood on

Ryosuke's face fully revealed

Ryosuke's angry tears

Ryosuke has dark-brown hair and light-brown eyes.

Personality

A shut-in, Ryosuke was a mentally unstable person who turned toward idols to feel loved in his life. His room being filled with Ai Hoshino's poster clearly shows his strong obsession on her. As a result, when he learned that his top idol had "deceived" him by having twin children, he snapped and tried to kill her on two separate occasions, succeeding on the second. However, when he was proven wrong about Ai not even remembering his name, regret may have instantly hit him, which he could not properly process, thus running away from the scene and committed suicide eventually.

Spoilers Ahead!

Notably, when dating Nino, he appeared to have loved her, but later broke up with her as he found a new idol; Ai, which suggests he was not faithful.

Plot

After learning from someone that Ai Hoshino was pregnant, Ryosuke was enraged and went to the hospital where she was staying. Garnering suspicion from her doctor Gorou Amamiya, a chase started between the two, ending with Ryosuke taking Gorou's life by pushing him off the cliff.

A few years later, Ryosuke would learn from the same person the address of Ai's new apartment. Concealing a knife within a bouquet of white roses, Ryosuke went to the apartment and fatally stabbed Ai in the stomach at her home. As Ryosuke began to lash out at a bleeding Ai, she weakly told him that she wanted to love her fans, even remembering his name and the star sand he gifted her. Hearing those words caused Ryosuke to run away in horror and anguish, leaving Ai to die from her injuries.

Ai's death was announced to the public and it was later revealed that Ryosuke had committed suicide shortly after. Because Ryosuke was already dead, the investigation revolving around Ai's murder ended instantly.

For the movie 15-year Lie, he is cast under a fake name, Ryosuke Kaihara「貝原 (かいはら) 亮 (りょう) 介 (すけ) , Kaihara Ryōsuke^?」 and Aqua Hoshino, the sole witness to his crime, is set to portray him. The role then transferred to another actor, Tomo Ayabe.

Manga Appearances

Prologue: Childhood
Chapter 1: Mother & Children	Debut
Chapter 2: Big Brother & Little Sister	Absent
Chapter 3: Babysitter	Absent
Chapter 4: How to Smile	Absent
Chapter 5: Director & Actress	Absent
Chapter 6: Child Actors	Absent
Chapter 7: If You Fear Falling, You'll Fall Harder	Absent
Chapter 8: Ai Hoshino Part 1	Appears
Chapter 9: Ai Hoshino Part 2	Appears
Chapter 10: Introduction	Imagined

Private
Chapter 67: Drinking Party	Absent
Chapter 68: Liberation	Absent
Chapter 69: Room Tour	Absent
Chapter 70: Flame	Absent
Chapter 71: Pedestrian Bridge	Absent
Chapter 72: Freedom	Absent
Chapter 73: Smart	Absent
Chapter 74: Takachiho	Absent
Chapter 75: Mother and Mother	Absent
Chapter 76: Music Video	Absent
Chapter 77: Reunion	Absent
Chapter 78: Use	Absent
Chapter 79: Duty	Flashback
Chapter 80: Wish	Absent

Mainstay
Chapter 81: Rapid Progress	Absent
Chapter 82: B-Komachi Night	Absent
Chapter 83: Obsessed	Flashback
Chapter 84: Hard Selling	Absent
Chapter 85: Calculation	Absent
Chapter 86: AD	Absent
Chapter 87: Lies	Absent
Chapter 88: Offer	Absent
Chapter 89: Cosplay	Absent
Chapter 90: Compliance	Absent
Chapter 91: Dig Deep	Absent
Chapter 92: Ritual Purification	Absent
Chapter 93: Leak	Absent
Chapter 94: Breakthrough	Absent
Chapter 95: Blindness	Absent
Chapter 96: White Roses	Absent
Chapter 97: Together	Absent
Chapter 98: Going Astray	Absent
Chapter 99: Drinking	Absent
Chapter 100: Industry	Absent

Movie
Chapter 109: Night	Absent
Chapter 110: How It Began	Absent
Chapter 111: Mammon-Worship and Passion	Absent
Chapter 112: Towards the Future	Flashback
Chapter 113: Commercial Work	Absent
Chapter 114: Interpersonal Audition	Absent
Chapter 115: Roles	Absent
Chapter 116: Responsibility	Absent
Chapter 117: Panda	Pictured
Chapter 118: Activation	Absent
Chapter 119: Biological Mother	Absent
Chapter 120: Lack of Ability	Absent
Chapter 121: Sarina Tendouji	Absent
Chapter 122: Doc	Absent
Chapter 123: Bad Move	Absent
Chapter 124: Reversal	Absent
Chapter 125: Dazzled	Absent
Chapter 126: Management	Absent
Chapter 127: Scouting A Girl	Absent
Chapter 128: Script Reading	Portrayed
Chapter 129: Piece	Absent
Chapter 130: Basic Tactic	Absent
Chapter 131: Atonement	Absent
Chapter 132: Nino	Absent
Chapter 133: Acting	Absent
Chapter 134: Depths	Absent
Chapter 135: By Her Side	Absent
Chapter 136: Fight	Absent
Chapter 137: Idol	Absent
Chapter 138: Amends	Absent
Chapter 139: Lookism	Absent
Chapter 140: Is This Right?	Absent
Chapter 141: Chain	Absent
Chapter 142: Responsibility	Absent
Chapter 143: Blind Follower	Absent
Chapter 144: Fan of the Originals	Absent
Chapter 145: Children	Absent
Chapter 146: Role	Absent
Chapter 147: Wish	Portrayed

Toward the Stars and Dreams
Chapter 153: Fiction	Absent
Chapter 154: 15-Year Lie	Flashback
Chapter 155: Happy End	Absent
Chapter 156: MEMe	Absent
Chapter 157: An Ordinary Day, A Wonderful Day	Absent
Chapter 158: Jewel	Mentioned
Chapter 159: Resonance	Flashback
Chapter 160: Eye	Flashback
Chapter 161: Future	Absent
Chapter 162: Aqua Hoshino	Absent
Chapter 163: You	Absent
Chapter 164: Finale	Absent
Chapter 165: And Then	Pictured
Chapter 166: Star	Absent

Anime Appearances

Season 1
Episode 1: Mother and Children	Debut
Episode 2: Third Option	Absent
Episode 3: Manga Based TV Drama	Absent
Episode 4: Actors	Absent
Episode 5: Reality Dating Show	Absent
Episode 6: Egosurfing	Absent
Episode 7: Buzz	Absent
Episode 8: First Time	Absent
Episode 9: B-Komachi	Absent
Episode 10: Pressure	Absent
Episode 11: Idol	Absent

Season 2
Episode 12: Tokyo Blade	Absent
Episode 13: The Telephone Game	Absent
Episode 14: Rewriting	Absent
Episode 15: Emotional Acting	Absent
Episode 16: The Curtain Rises	Absent
Episode 17: Growth	Absent
Episode 18: Sun	Absent
Episode 19: Trigger	Absent
Episode 20: Dream	Absent
Episode 21: Liberation	Absent
Episode 22: Freedom	Absent
Episode 23: Reunion	Absent
Episode 24: Wish	Flashback

Trivia

• Ryosuke's last name is first presented as Kaihara in Chapter 128 when an actor is cast as him for the movie The 15 Year Lie, but it later transpires that this was a fake name. His real last name is later presented as Sugano in Chapter 155. The name Ryosuke is also written differently - 亮介 instead of 良介.
• It is been stated that Ryosuke commited suicide, when his girlfriend Nino asked him to do, when she got to know that he murdered Ai.

References

Ai Hoshino • Takamine • Fuyuko Niino • Watanabe • Meimei • Ari • Kyun Ruby Hoshino • Kana Arima • Mem-Cho Aqua Hoshino • Pieyon Ichigo Saitou • Miyako Saitou • Shun Yoshizumi Kana Arima • Aqua Hoshino • Ruby Hoshino • Frill Shiranui • Minami Kotobuki Akane Kurokawa • Taiki Himekawa • Toshirou Kindaichi (Founder) Masaya Kaburagi • Hikaru Kamiki • Ai Hoshino

Ai Hoshino • Kana Arima • Aqua Hoshino Taishi Gotanda (Director) Kana Arima • Melt Narushima • Aqua Hoshino Masaya Kaburagi (Producer) Yoriko Kichijouji Yuki Sumi • Akane Kurokawa • Mem-Cho Aqua Hoshino • Nobuyuki Kumano • Kengo Morimoto Masaya Kaburagi (Producer) Taiki Himekawa • Kana Arima • Melt Narushima Akane Kurokawa • Aqua Hoshino • Sakuya Kamoshida Toshirou Kindaichi (Director) • Goa (Scriptwriter) • Sumiaki Raida (Producer) Abiko Samejima Aqua Hoshino • Ruby Hoshino • Kana Arima Tetsu Urushibara (Director) • Shun Yoshizumi (Assistant Director) • Masaya Kaburagi (Producer) Ai Hoshino • Hikaru Kamiki • Airi Himekawa Fuyuko Niino • Gorou Amamiya • Seijuro Uehara Ruby Hoshino • Aqua Hoshino • Tsukuyomi • Frill Shiranui Mem-Cho • Kana Arima • Akane Kurokawa • Melt Narushima • Taiki Himekawa Taishi Gotanda (Screenplay, Director) • Masaya Kaburagi (Producer) Yoriko Kichijouji (Script Doctor) • Abiko Samejima (Script Doctor)