A possible concise summary is:
The video is about the second day of a journey across Japan, where the hosts visit the Kumamoto prefecture and its attractions. They stay in a polystyrene dome house, climb an active volcano, and relax in a hot spring resort. They also have to complete a challenge of writing and performing a rap song about their day. The summary is about 100 words long, which is less than 10% of the original text.
Here are the key facts extracted from the text:
1. The text is a transcript of a video from the series Journey Across Japan by Abroad in Japan.
2. The video documents the second day of the journey across Kyushu, from Kagoshima to Kumamoto.
3. The video features Chris Broad, Joey the Anime Man and Natsuki as the main travelers.
4. The travelers stay in a polystyrene dome house village called Aso Farm Village near Mount Aso, Japan's largest active volcano.
5. The travelers visit the crater of Mount Aso and experience the sulphur gas and the volcanic desert.
6. The travelers have a challenge to write and perform a rap song about their day, sent in by a viewer named Richard Tolson.
7. The travelers end their day at Kurokawa Onsen, a picturesque hot spring resort with private baths in their rooms.
8. The rap song is called Too Much Volcano and it mentions the dome house, the volcano, the black tatami mats and the pizza pastrami salami rhyme.
9. The rap song is performed in various locations such as the volcanic desert, the private bath and the riverside.
10. The video ends with a teaser for the next episode where they continue their journey to Nagasaki.