The events and power-ups the character Ichijou Tsukino gain through the course of Highschool DxD: Яe-birth:
Volume 1: The lad and the legacy of the Red Dragon Emperor Edit
- Ichijou meets Berolina Gremory; dies and is ressurected by her in ": She can't be for real, right?"
- Ichijou meets Serena Sitri Yoko Akabane and becomes the former's 'wife' in "Ch.3: Recruiting is easy, right?"
- Ichijou (Partially) awakens his Boosted Gear in "Ch. 3: This is a joke, right?"
- Ichijou meets Annabelle Hellsing in 'Chapter 4: Vampires are cool too, right? Part 1'
- ichijou's team defeats Annabelle Hellsing in 'Chapter 6: Vampires are cool too, right? Part 3'. Berolina's Peerage gain a Knight piece.
Volume 2: Red Dragon Emperor's bizarre everyday life Edit
- Ichijou learns the Peerage system, fights and meets Clare Veritas and Enrico Maxwell in 'Chapter 7: unlucky is not quite the word.'
- Ichijou meets Tasha Campbell and Nemesis Gremory in 'Ch. 10: Sekiryuutei is not quite the Word.'.
- Ichijou (unwillingly) takes part in his first Rating Game against Nemesis Gremory in 'Ch. 11: Melancholy is not quite the word.'.
- Ichijou meets Nero Gladius and lose his match against him in 'Ch. 12: I'm Gremory's knight, after all.'.
- Ichijou meets Hwan Jin-Young in 'Ch. 14: Extras are always smiling, after all.'.
Volume 3: The Cheesy Sekiryuutei and the crimson Kings Edit
- Ichijou gain Rhongomiant and Akeno Himejima's ribbon, and learn magic in 'Ch. 15: I'm just Tsukino Ichijou, but still!'.
- Ichijou awakens Juggernaut Drive in 'Ch. 16: I just want some silence.'.
- Ichijou meets Yagura Gremory and (unknowngly) unlocks Balance Breaker in 'Ch. 17: I want...!'.
- Ichijou meets Alice Gremory and Raven Phenex in 'Ch. 18: Alice Gremory, shipper extraordinaire!'.
- ichijou meets Liu Bei in 'Ch. 19: Let's just end this and go home.'.
- Ichijou awakens 'Crimson Queen Gear Drive' and fights Nero Gladius in 'Ch. 20: Crimson Queen Gear Drive!'.
- Ichijou fights and defeats Ginko in 'Ch. 21:A batllefield filled with poetry.'. Yagura then take over his body to continue his Rating Game.
- Ichijou awakens Balance Breaker, but lose the match for his own will in 'Ch 22: You liar.'.
- Ichijou meets Mary Beelzebub, her Queen Katalia and her daughter Irene Dantalion in 'Extra chapter: A not-so-nice doctor.'.
Volume 4: The hammy sekiryuutei and his lovely friends Edit
- Ichijou meet and befriends Ren in 'Ch. 24: Strange morning, strange day.'.
- Ichijou discovers Annabelle's motivation in 'Ch. 25: Tsukino's new friends.'.
- Ichijou fights both Annabelle and Ren in 'Ch. 26: Between flat-chest and AA-cups.'. Yagura takes over and uses Balance Breaker for the second time.