Shutsujin★Konchuu Bushou Chousokabe!
出陣★昆虫武将チョウソカベ！
A boy in middle school named Baku struggles to connect with his classmates and retreats to an empty stairway at school, which he refers to as his "castle." One day, while there, he overhears a conversation in which a classmate, Kirin, is addressed using the old-fashioned honorific "dono." The speaker is an insect capable of speech.