Haruki Motomiya remains undocumented within the anime "Nageki no Ryū" across all verified media sources. No references to this character, the series itself, or associated materials exist in available records.

The surname Motomiya solely corresponds to the Motomiya Movie Theater in Fukushima. The given name Haruki appears exclusively in unrelated contexts: Itou Haruki (AKB0048 Roleplay Wiki), Motomiya Haruki from the 1988 OAV "Mahjong Flight Story Weeping Dragon", an unnamed detective in "Third Avenue Still Turns Today", and actress Hikari Motomiya in an Umineko stage adaptation.

No details regarding Haruki Motomiya's role, appearance, or narrative presence in "Nageki no Ryū" emerge from seasons, films, OVAs, or derivative works.