Tao Tsuchiya (Ultraman Zero: The Revenge of Belial, Rurouni Kenshin Kyoto Inferno) on the other hand as Shizuku Mizutani, a self-absorbed overachiever who is only concerned in maintaining the highest grades in school. She was tasked to deliver the then suspended Haru school materials and Haru interprets it as an act of friendship and starts latching onto her, beginning their rather strange relationship.
- Yuki Furukawa (Mischievous Kiss: Love in Tokyo) as Yuzan Yoshida, Haru's big brother
- Yuki Yamada (Kaizoku Sentai Gokaiger) as Kenji "Yamaken" Yamaguchi, Haru's old friend and current rival
- Elaiza Ikeda (Bow Then Kiss) as Asako Natsume, a pretty girl who despises boys
- Minami Hamabe (Live-Action Anohana drama special) as Chizuru Oshima
- Gaku Sano (Kamen Rider Gaim) as Sōhei "Sasayan" Sasahara, Haru and Shizuku's classmate and a baseball team member
- Mokomichi Hayami (Zettai Kareshi) as Mitsuyoshi "Micchan" Misawa, Haru's cousin
The live-action My Little Monster is directed by Sho Tsukikawa (live-action Kurosaki-kun no Iinari ni Nante Naranai, Kimi no Suizō o Tabetai) and is set for an April 27, 2018 release.
[Source: Anime News Network]