信じられないshinjirarenaiだろうdarouけどkedoそのsono洞窟doukutsuからkara怪獣kaijuuga現れたarawaretaんだnda
Believe it or not, a monster emerged from the cave.

© Based on JMdict, KANJIDIC2, and JMnedict, property of the Electronic Dictionary Research and Development Group, used in conformance with the Group's licence. Example sentences from the Tatoeba project (CC BY 2.0). Kanji stroke order data from the KanjiVG project by Ulrich Apel (CC BY-SA 3.0). See comprehensive list of data sources for more info.

Search other dictionaries for 信じられないだろうけど、その洞窟から怪獣が現れたんだ。:
Yahoo!辞書 / goo辞書 / alc.co.jp / Weblio / Wiktionary