- Withoutwarning,millionsofmysteriousalien"doors"suddenlyappeararoundtheglobe.Inarushtodeterminethereasonforthe爆丸小子第1部irarrival,mankindmustworktogethertounderstandthepurposeofthesecosmicanomalies.Bizarreincidencesoccurringaroundthesentientdoorsleadshumanitytoquestiontheirownexistenceandanalteredrealityastheyattempttoenterthem.