Toaru Kagaku no Railgun
Daihasei Festival Arc (Railgun)
- Main article: Daihasei Festival Arc (Railgun)
During the three-legged race, he attempts to ambush Amime under instruction by one of the Ninoudefuzoku participants, a telepath whose ability is limited to only rodents, but Amime swats him aside, angering his instructor.
- Kotarou is the only named hamster during the three-legged race. Including him, six hamsters were involved in the race.
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