A special, multi-part side story manga set in the world of *Mairimashita! Iruma-kun*, focusing on Kalego during his days as a student of Babyls Demon School.

An official *Mairimashita! Iruma-kun* anthology series, featuring stories of Iruma Suzuki and his friends as students of Babyls Demon School.

Prequel story bundled with the first press release of the 1st Blu-ray volume of Sidonia no Kishi anime. *Note: This oneshot is also included in final volume 7 of the Shinsōban edition.*

A spin-off of *Mairimashita! Iruma-kun* made in collaboration with the Youtube/Nico Nico Douga group *○○ no Shuyaku wa Wareware da!* The story follows Shaoron, a freshman at Babyls who wants to join the Student Council and become popular.

A full-color crossover story between Sidonia no Kishi and Blame!.

Short epilogue story for Blame! Movie bundled with the limited edition Blu-ray Disc release.

First issue of a canceled series; collected (in thumbnails) in Blame and So on (Artbook)

A spin-off manga featuring Iruma Suzuki, Shax Lead, and Soi Purson - the three of which make up the titular "Boku Alliance" - as they play various Netherworld video games.

Volume 1 (2025/05/07) Cover Illustration: Wata 1. **Wonderful Life** (ワンダフルライフ) \[Story: Shasendou Yuuki, Art: Kuwabara Tamotsu\] 2. **Mary, Chi wo Nonde** (メアリ、血を飲んで) \[Chiruha Chinmi\] 3. **Tsuki to Taiyou no Kekkon** (月と太陽の結婚) \[Asahi Tetora\] 4. **1-jikango, Watashi-tachi wa** (1時間後、私たちは) \[Hinoeda Miyako\] 5. **Dream Land de Futari,** (ドリームランドでふたり、) \[Haruhana Aya\] 6. **Geranium ni Yosete** (ゼラニウムによせて) \[Shanimuni\] 7. **Konintodoke** (婚姻届) \[Ookura Nata\] 8. **Kittageru!** (切ったげる!) \[Izumi\] Volume 2 (2025/05/07) Cover Illustration: Wata 1. **Yukitsubaki** (雪椿) \[Yakushiji Utsutsu\] 2. **Itsumademo Otomodachi** (いつまでもお友達) \[Morinaga Miki\] 3. **Koukai to Sayonara** (後悔とさよなら) \[Story: Desuyama Hanako, Art: Shishio\] 4. **Nagusame no Hana** (慰めの花) \[Nishizuka Em\] 5. **Guilty Kiss** (ギルティKISS) \[Izumi\] 6. **Orange** \[Aoyama Wasabi\]

Tanaka-san is a legendary hotel man (concierge), and after his death, he became a legend in the underworld. In the underworld, Mei works at the dilapidated Hotel Helheim. It was once a glorious hotel, and one where Mei has many fond memories. One day, Tanaka-san appears, ready to restore the Hotel Helheim to its former success. Mei will become the famous Tanaka-san's assistant, as he works to make Hotel Helheim a top-class underworld hotel! (Source: MangaHelpers)