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Onshuu no Braunian Motion (恩讐のブラウニアンモーション, Onshuu no Buraunian Mōshon?) is a spin-off manga of the Steins;Gate visual novel that details the past of the CRT store owner Yugo Tennouji, a.k.a Mr. Braun, in the worldline 0.523307%.

The title is a play on words between his nickname "Mr. Braun", and the scientific phenomenon known as Brownian motion.



The story is set in 1996-2000, and concentrates on the relationship between a young Yugo Tennouji and Suzu Hashida, 22 years after she leapt back to 1975 to secure the IBN 5100. Yugo, who was then working actively as a high ranking Rounder, is tasked with a mission by the Committee of 300 to travel to Japan, Akihabara, and investigate Suzu and also locate the IBN 5100. During his mission, Yugo develops strong relationships with both Suzu and Tsuzuri Imamiya (whom he would later marry and give birth to Nae Tennouji with). This was seen by Yugo's higher-ups as a problem, thus he was faced with the burden of constant coercion from the Rounders, and safety of his newly formed family and friends.

The story begins on the 4th July, 2010, following the events of a regular day wherein Okabe and the Lab Mems experiment with their new gadget, and Tennouji threatens to raise the rent. After the ordinary series of events, Nae comes to visit her father, and Yugo decides to take her on a trip to visit Suzu's gravestone. He remarks that "Nae won't remember that place now, I think".

We look back in time to the 22nd December, 1996 and see a younger Yugo Tennouji. His new mission is to go to Japan and investigate a strange woman, Suzu Hashida. Her past prior to 1975 is blank, arousing suspicion from SERN and the Rounders. She is the suspected hacker of SERN, and may also possess one of the few remaining IBN 5100s. Yugo meets her by chance just after his arrival in Akihabara, as she mistakenly knocks him out for thinking he was harassing her student, Tsuzuri Imamiya.

After the confusion is cleared, Suzu—who was then working as a university professor and landlord (of the building where the Future Gadget Laboratory would be located)—offers a cheap rent room as an apology to Yugo. After realising who she had just met, Suzu, imitating Okabe, remarks to herself that this must be "the choice of Steins Gate", and continues to help Yugo.

Yugo initially takes advantage of his quick relation to Suzu as a means to accelerate his mission, however he begins to form genuine bonds to both Suzu and Tsuzuri, complicating his job as a Rounder.

List of Chapters

Onshuu no Braunian Motion Volume 1
Braunian Motion.png
List of Chapters:
1. Chapter 1: 2010/7/4 (SUN) (第1章2010/7/4(SUN), Dai 1-shō 2010/7/4(SUN)?)

2. Chapter 2: 1997/7/2 (FRI) (第2章1997/7/2(FRI), Dai 2-shō 1997/7/2(FRI)?)
3. Chapter 3: 1997/8/20 (WED) (第3章1997/8/20(WED), Dai 3-shō 1997/8/20(WED)?)
4. Chapter 4: 1997/8/21 (THU) (第4章1997/8/21(THU), Dai 2-shō 1997/8/21(THU)?)
Special. Special Chapter: 2010/8/15 (SUN) (特別章2010/8/15 (SUN), Tokubetsu Akira 2010/8/15 (SUN)?)
Extra. Omake Rafushuu (おまけラフ集, Omake Rafushū?)

May 14, 2011
ISBN-10 4047272663

ISBN-13 978-4047272668

Onshuu no Braunian Motion Volume 2
List of Chapters:
5. Chapter 5: 1997/9/23 (TUE) (第5章1997/9/23(TUE), Dai 5-shō 1997/9/23(TUE)?)

6. Chapter 6: 1997/12/8 (MON) (第6章1997/12/8(MON), Dai 6-shō 1997/12/8(MON)?)
7. Chapter 7: 1998/3/11 (WED) (第7章1998/3/11(WED), Dai 7-shō 1998/3/11(WED)?)
8. Chapter 8: 2000/5/18 (THU) (第8章2000/5/18(THU), Dai 8-shō 2000/5/18(THU)?)
9. Chapter 9: 2001/10/22 (MON) (第9章2001/10/22(MON), Dai 9-shō 2001/10/22(MON)?)
10. Chapter 10: 2010/8/13 (FRI) (第10章2010/8/13(FRI), Dai 10-shō 2010/8/13(FRI)?)
11. Final Chapter: 2010/8/15 (THU) (最終章2010/8/15(THU), Sai Shūshō 2010/8/15(THU)?)
Special. Special Chapter: 2010/7/29 (THU) (特別章2010/7/29(THU), Tokubetsu Akira 2010/7/29(THU)?)
Extra. Denshiban Omake (電子版オマケ, Denshiban Omake?) ( Digital release only )

July 14, 2014
ISBN-10 4047281751

ISBN-13 978-4047281752


Main Characters

Supporting Characters


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