Uesugi Fuutarou must have thought that giving Nino a dog collar for her eighteenth birthday would make a good practical joke. Little did he know that it would set off a chain of events that would turn out to be so much more than what he had bargained for. Set during the Third-Year arc (before Kyoto school trip). Rated M for mature content.

Humanity has become an interplanetary civilisation, achieving 1.0 on the Kardashev scale. Selected to represent Japan on its first manned foray beyond the Solar System, the scions of the Yukinoshita and Hayama families were made to leave everything behind on a century-long voyage for the stars. A certain loner seeks to catch up - just how far would he go in search of the past?

Global nuclear winter was not what the Service Club had signed up for - but neither was giving up and dying. Would a ragtag group of loners be able to survive the days after the end? Set during Hachiman's third year at Sobu.