Is there an ongoing Welcome to Demon School! Iruma-kun Season 4 collaboration right now?

No running collaboration is currently confirmed. AniHeat holds 2 past records.

What past Welcome to Demon School! Iruma-kun Season 4 collaborations are on record?

AniHeat records 2 finished collaborations, for example Champion BUZZ Vol. 36, the special extra issue included with the digital edition of Weekly Shonen Champion No. 40, goes on sale Thursday, Sept. 3! Look for the special collaboration cover celebrating the Sept. 8 simultaneous release of Vol. 1 of Welcome to Demon School! Iruma-kun: Boku Domei and Baki no Wa!, Book: Welcome to Demon School! Iruma-kun (Vol. 49) Animate Set Now on Sale. After graduating, Henri's secret mission at the Demon Customs Office: monitor the rare species 'humans'. #AnimateSet includes BIG acrylic keychain. #AnimateBonus includes message paper..