Man pages matching name rain in section 6:

rain.6.en	debian 10 / bsdgames
rain.6.ja	debian 10 / manpages-ja
rain.6.en	debian 11 / bsdgames
rain.6.ja	debian 11 / manpages-ja
rain.6.en	debian 12 / bsdgames
rain.6.ja	debian 12 / manpages-ja