Tokyo MER: Mobile Emergency Room Collection

The individuals that comprise the Tokyo MER team rush to on-site disasters and accidents, performing life-saving treatment thanks to the OR equipped within their vehicle. Their one mission is simple: leave no one dead. But conflicts arise when an unprecedented event rocks Yokohama after a bomb explodes in Landmark Tower, leaving thousands fighting to escape. Although the chief doctor Kitami believes they should not wait and presses for a quick dispatch, the more level-headed Chief Kamoi of the elite Yokohama MER thinks otherwise — they need to wait until the area is safe to enter, or they won’t be able to save anyone.

Half a year has passed since the official approval of TOKYO MER. Kitami is racking his brains over the issue of a second doctor to replace Otowa, who has left the team in order to expand MER to ordinance-designated cities nationwide. Some members of the team want Hina to be promoted, but Otowa asserts that Hina should pursue her path of cardiovascular surgery. She felt the pressure that Hina could take Otowa's place, and she was troubled.

A massive volcanic eruption has occurred on a remote island in the southern seas, creating an unprecedented disaster. The Nankai MER members must go save everyone in the island.