Fics like Peek through the past

Just after the music festival, the misfit gathered in the Royal one, but then all of them got kidnapped and have to see the blue haired boy past life.

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1. Reaction and Matchmaking Attempts by Cakeoholic (백작가의 망나니가 되었다 - 유려한 | Lout of Count's Family | Trash of the Count's Family - Yulyeohan)
2. Beginning of the End by who_stole_my_fries (백작가의 망나니가 되었다 - 유려한 | Lout of Count's Family | Trash of the Count's Family - Yulyeohan)
3. A Hero in a Demon school!!!! by Greyninja27 (僕のヒーローアカデミア | Boku no Hero Academia | My Hero Academia, 魔入りました! 入間くん | Mairimashita! Iruma-kun | Welcome to Demon School! Iruma-kun (Manga), more)
4. Tackling Tuesday (let’s flip everything over together) by Vodkassassin (백작가의 망나니가 되었다 - 유려한 | Lout of Count's Family | Trash of the Count's Family - Yulyeohan)
5. Forced Employment? How about Forced invasion of privacy! by Shadow08081, Vidow_The_Witch (僕のヒーローアカデミア | Boku no Hero Academia | My Hero Academia (Anime & Manga), 백작가의 망나니가 되었다 - 유려한 | Lout of Count's Family | Trash of the Count's Family - Yulyeohan)
6. Unbridled Red by XxMelon_puddlingxX (Batman - All Media Types, 백작가의 망나니가 되었다 - 유려한 | Lout of Count's Family | Trash of the Count's Family - Yulyeohan)
7. Hell's Crimson Angel by Cakeoholic (백작가의 망나니가 되었다 - 유려한 | Lout of Count's Family | Trash of the Count's Family - Yulyeohan, Hellaverse | Hazbin Hotel & Helluva Boss Universe, more)
8. I just can’t see the simple things I can’t keep, what am I supposed to be? by lyle (백작가의 망나니가 되었다 - 유려한 | Lout of Count's Family | Trash of the Count's Family - Yulyeohan)
9. Extremely HOT Disaster: Nothing beats the heat like an ice cold treat! by FanTrashStick (백작가의 망나니가 되었다 - 유려한 | Lout of Count's Family | Trash of the Count's Family - Yulyeohan, Extreme Cold Disaster: Hot Spring Street Simulation Management)
10. Authority of the Demon King by Alittlwweirdo (魔入りました! 入間くん | Mairimashita! Iruma-kun | Welcome to Demon School! Iruma-kun (Manga), 魔入りました! 入間くん | Mairimashita! Iruma-kun | Welcome to Demon School! Iruma-kun (Anime), more)
11. Conflicted Ties by Secaada (백작가의 망나니가 되었다 - 유려한 | Lout of Count's Family | Trash of the Count's Family - Yulyeohan, Twisted-Wonderland (Video Game), more)
12. The Rose of Slytherin and the Shadow of Gryffindor by Muguetdesbois (백작가의 망나니가 되었다 - 유려한 | Lout of Count's Family | Trash of the Count's Family - Yulyeohan, Harry Potter - J. K. Rowling)
13. Tell Me—Can you see me? by Williamcipher (魔入りました! 入間くん | Mairimashita! Iruma-kun | Welcome to Demon School! Iruma-kun (Manga), 魔入りました! 入間くん | Mairimashita! Iruma-kun | Welcome to Demon School! Iruma-kun (Anime))
14. My Other Half by RAMandSAM (백작가의 망나니가 되었다 - 유려한 | Lout of Count's Family | Trash of the Count's Family - Yulyeohan)
15. Child of Iron by orphan_account (백작가의 망나니가 되었다 - 유려한 | Lout of Count's Family | Trash of the Count's Family - Yulyeohan, The Avengers (Marvel Movies), more)
16. Home Is Where the Doctor Is by artificialslover (백작가의 망나니가 되었다 - 유려한 | Lout of Count's Family | Trash of the Count's Family - Yulyeohan, The Avengers (Marvel Movies))
17. Amaranthine by Pearlised (백작가의 망나니가 되었다 - 유려한 | Lout of Count's Family | Trash of the Count's Family - Yulyeohan)
18. Welcome to demon school iruma kun by Nyxxays (魔入りました! 入間くん | Mairimashita! Iruma-kun | Welcome to Demon School! Iruma-kun (Manga))
19. Let me Slack! by TheHopelessSlacker (백작가의 망나니가 되었다 - 유려한 | Lout of Count's Family | Trash of the Count's Family - Yulyeohan, 전지적 독자 시점 - 싱숑 | Omniscient Reader - Sing-Shong)
20. Something Unexpected {HIATUS} by Insatiable_Fool (魔入りました! 入間くん | Mairimashita! Iruma-kun | Welcome to Demon School! Iruma-kun (Manga), 魔入りました! 入間くん | Mairimashita! Iruma-kun | Welcome to Demon School! Iruma-kun (Anime))