Gouseiken DaiSword

is a Japanese translocation-themed manga series by Yūichi Hasegawa.

Story
On January 25, 1993, 8:36PM, a whole middle school (Ques Middle School) suddenly vanished along with its 550 students! Now in the world of "Awa no Chuoukai (泡の中央界)", the school gets caught in the middle of a war between the northern kingdom and the White Demon Kingdom, Terte Vitas (テルテ・ウィタス). As the Northern army reaches Ques school grounds, the school gets approached by a monster attack where a student named Ohta Momochi breaks the seal of the God Sword "Dai Sword" and manages to protect the school. Hearing their current world's situation from a Terte Vitas mage named Yurina Ta Kara, Ohta and the student council president, Koyo Sentou, lead the rest of the student body on their quest to return home.

Development
Unlike most isekai-themed manga and anime where present-day people are transmigrated into other worlds through predicaments, this manga is one of Hasegawa's concepts that involve "multiple adults" being involved.

In October 1992, a riot broke out within Kadokawa Shoten which led to the forming of the Media Works division split from Kadokawa. Under such circumstances, Hasegawa who was with Kadokawa at the time and was known for his popular "Maps" manga began serialization of the series under the title "DaiSword" in the "Monthly Comic Comp" March 1993 issue. The manga went on hiatus from Chapter 20 after the magazine ceased publication with the October 1994 issue.

The series resumed after it was moved to Tokuma Shoten's "Monthly Shonen Captain" magazine from the January 1995 issue, and the title changed to its current name.