- Official name：舘島虎徹
- English name：Kotetsu Tatejima
- Chinese name：馆岛虎彻
- Other names：たてじま こてつ
- Gender：Female
- Birthdate：Mar 14
- Height：154cm
- Bloodtype：A
- 趣味：食べること / ピアノ
『Kotetsu Tatejima』
Kohane's classmate, who often lacks confidence and is embarrassed about her strong sounding name.
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