Ryuuichirou Isaka
井坂龍一郎
He is the executive Director of Akihiko's publisher, and the childhood friend of Haruhiko (Usami's brother).
Apparitions
Junjo Romantica
SUPPORTING
Sekai Ichi Hatsukoi - The World's Greatest First Love
SUPPORTING
Sekai Ichi Hatsukoi - The World's Greatest First Love Season 2
SUPPORTING
Junjo Romantica 2
SUPPORTING
Junjou Romantica 3
SUPPORTING
The World's Greatest First Love
SUPPORTING
Junjo Romantica
SUPPORTING
Junjou Mistake
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