Around a month after the time machine disappearance in Steins;Gate worldline, Okabe is struck with the familiar vertigo, Reading Steiner, and after the vertigo disappears, he gets a D-Mail from 2025 Okabe Rintarou that explains this worldline is in dangerous future which is worse than Dystopia or World War III. His mission is to retrieve an IBN 5100 from a person known as Neidthardt. (Source: Steins;Gate Wiki)

An alternate Armitage story that ran in Shounen Captain magazine. Heavily utilizes both action and fanservice to explore Ross and Armitage's investigation into illegal android manufacturing on Mars.

Joe Tazuna has always been the most selfless person Sara Chidouin has ever known, someone she could count on to take a bullet for her. But that trust is put to the test when they wake up restrained to some strange tables and discover Joe holds a key that can set only one of them free. Thus begins a mysterious and sadistic game that will require all of their wits and faith in each other to survive…! (Source: Yen Press)

「You, ah —— hurry up and save me！」 A beautiful girl commanded Koichi as she rushed at him. The girl’s cat-like sound pierced through Koichi’s head like a spear. 「—— Leave it to me！」 Koichi used all his strength and shouted. I have always been waiting for this moment…! ——Sato Koichi had always longed for a 「special」 and 「non-routine」17 year old life. Although he wears two different colored contact lenses and always tried to say meaningful things, he actually lived a relatively normal life. But after encountering the beautiful young girl Arles he finally got his wish and got an ability ! However Koichi’s ability was quite useless ! ? Legend of the strongest dreamer officially starts ! ( It should ! )