Japanese title: ペンギンズ・ジャーニーEx
Release: Comiket 93
Melonbooks: https://www.melonbooks.co.jp/detail/detail.php?product_id=348752
Pixiv: pixiv #66292207
Niconico Seiga: http://seiga.nicovideo.jp/watch/mg289972
Togetter (with additional commentaries): https://togetter.com/li/1183200