Sources for official information     

Manga and Anime
  • Official manga translation: VizMedia
  • Fan translation: Mach 20 scans
  • Anime subtitles: Funimation
  • Anime English dub: Funimation 
Manga Extras
  • Terasaka’s pick-up profile (Vol 2)
  • Muramatsu’s pick-up profile (Vol 6)
  • Terasaka’s bio (Vol 6)
  • Yoshida’s bio (Vol 10)
  • Muramatsu’s bio (Vol 10)
  • Hazama’s bio (Vol 13)
  • Technology & Home Economics rankings (Vol 13)
  • Itona’s bio (Vol 15)
  • Facts about the tentacles (Vol 15)
  • Terasaka & Hazama’s stats (Vol 15)
  • Yoshida’s pick-up profile (Vol 16)
  • Karasuma’s Report Card (Vol 16)
  • Itona’s pick-up profile (Vol 18)
  • Muramatsu’s stats (Vol 18)
  • Yoshida & Itona’s stats (Vol 21)
Character Databook - Roll Book Time
  • Terasaka’s Character Profile
  • Hazama’s Character Profile
  • Muramatsu’s Character Profile
  • Yoshida’s Character Profile
  • Itona’s Character Profile
  • Terasaka Gang’s initiation ritual 
  • Character duo appearances
  • LINE conversation
  • Kunugigaoka city map
  • Former club activities 
  • Relationship chart 
Graduation Album
  • Terasaka’s Character Profile
  • Hazama’s Character Profile
  • Muramatsu’s Character Profile
  • Yoshida’s Character Profile
  • Itona’s Character Profile
  • Terasaka’s personal history
  • Hazama’s personal history
  • Muramatsu’s personal history
  • Yoshida’s personal history
  • Itona’s personal history
  • Exam scores breakdown 
  • Valentine’s Day chocolates 
  • Yoshida’s dad 
Korotans
  • Korotan A - Main story
  • Korotan B - Main story
  • Korotan B - Yoshida & Itona’s lessons
  • Korotan C - Main story
  • Korotan C - Yoshida’s fashion
  • Korotan C - Hazama’s lesson
  • Korotan D - Main story
  • Korotan D - Muramatsu & Hazama’s lessons
  • Korotan D - Hazama’s test taking advice
  • Korotan D - Itona & Yoshida’s test taking advice 
  • Korosuu - Main story
  • Korosuu - Hazama’s lesson
  • Korosuu - Terasaka’s lesson