DokiSui: Doki-doki Suikoden
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"Doki Doki Suikoden'' is a simulation game released by IREM Software Engineering (IREM) for the PlayStation Portable (PSP) on May 12, 2011 . Irem's abbreviation is `` Dokisui '', and the title logo of the work is a large drawing of these four letters and a matching umbrella .