Mondaiji-tachi ga Isekai kara Kuru Sou Desu yo?: Onsen Manyuuki
Izayoi, Asuka, and You have been invited to participate in a Gift-Game at a hot spring village to help the small community there find a new water source.
OVA bundled with the eighth volume of the light novel.
"To Be Continued?" by Kaori Sadohara
"Black † White" by Iori Nomizu