ep01: Oshimi Shuzo (author of Aku no Hana)

ep05: Satou Yuuki (author of Youkai no Oisha-san)

ep07: Nagashii Kouhei (author of Houkago Sword Club)

ep09: Ooima Yoshitoki (author of Koe no Katachi)

ep10: Raiku Makoto (author of Doubutsu no Kuni)

ep11: Nakamura Hikaru (author of Saint Oniisan)

ep13: Nomura Yuusuke (author of Ikago no Ou)

ep13.5: tanu (Tari Tari's original character designer)

ep14: Yoshida Kenichi (animator, Eureka Seven's character designer)

ep15: Yuupon (Nitro+Chiral's SD character illustrator)