TV Special
Description
Shiki Iseya is the lead vocalist of idol unit HighxJoker under 315 Productions. His energetic personality shines through unique speech patterns, often using modifiers like "honkii" or "mega" and ending sentences with "す(ssu)". He addresses the Producer as "Producer-chan" and refers to fellow unit members by their given names in katakana with "cchi" appended, except Hayato Akiyama, whom he calls "Hayato Senpai".

Academically challenged, Shiki depends on last-minute group study sessions with his unit before exams. During middle school, he lacked confidence outside singing, frequently retreating to karaoke venues. This shifted when he witnessed HighxJoker’s entrance ceremony performance upon starting high school, inspiring him to chase his passions. He joined the light music club, later forming HighxJoker with Jun Fuyumi, Natsuki Sakaki, Hayato Akiyama, and Haruna Wakazato.

Shiki strongly favors spicy foods and candy. His appearance consistently features motifs or accessories of bear mascot "Kumacchi"—visible on clothing, his phone, or carried plush items. Though his exuberance sometimes causes social missteps, he remains self-aware of this tendency and expresses gratitude to the Producer for ongoing support. He lives by the principle "men speak with results", actively working to correct mistakes.

His media appearances include the TV series *The iDOLM@STER SideM* (2017), the OVA *The iDOLM@STER SideM: 315 Variety Pack! Made In Passion!* (2018), the series *The iDOLM@STER SideM: Wake Atte Mini!* (2018), and its OVA (2019). In the *315 Variety Pack! Made In Passion!* OVA, he performs insert song "315 Steelo!" alongside fellow idols.