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シルバーシートに座って寝てたオタクが秋葉原駅で…
→ “An otaku was caught napping on a silver seat at Akihabara Station...”
シルバーシート shirubā¹ shī¹to = silver sheet (noun) - refers to the foldable plastic seats in Japanese trains/stations
に ni = on/at (particle indicating location)
座って suwatte = sitting (v.) - colloquial form of 'sitting' (座る + て形)
座 su = sit / seat
わ wa = stem indicator
って tte = te-form connector (colloquial contraction)
寝てた neteta = was sleeping (v.) - colloquial past continuous of 'to sleep' (寝る + ていた → 寝てた)
寝 ne = sleep / lie down
てた teta = te-form + past continuous (colloquial contraction of ていた)
オタク otaku = otaku (noun) - fan, geek, or enthusiast (loanword from English 'otaku')
が ga = subject marker particle (focuses on the subject)
秋葉原駅 akihabara eki = Akihabara Station (noun) - famous anime/manga district in Tokyo
秋葉 akiha = autumn leaves
原 bara = field / plain
駅 eki = station
で de = at/in (particle indicating location where action occurred)
… = ellipsis (indicates suspense or incomplete thought)
