- This school also appears in the canon Corpse Party, go here to see.
St. Catherine Academy High School (セント・カテリーナ学園高等部 Sento Katerīna Gakuen Kōtōbu , lit. "Saint Catherine Academy Senior High School") is a senior high school where one background character that was introduced in Corpse Party attended.
- Akiko Matsuda (Second Year, Corpse Party: Coupling X Anthology only)
- Haruna Kizami (刻命 春奈 Kizami Haruna ) (Class II-A)