Mineru Wachi

Mineru is a fourth year student and lives in the Seikan's "Goddess Dormitory."

Mineru is a researcher who loves working with toxic gas, but due to that she often fails her experiments and even earned a nickname "Walking Toxic Gas Emitter." While working on her experiments, she feels most comfortable while just wearing panties and unbuttoned shirt.

Mineru finds Koshi Nagumo collapsed on the street from hunger and takes him to her dorm. After giving him food and meeting the other residents, Mineru proposes he lives there and works as dorm mother.

(Source: Megami-ryou no Ryoubo-kun Wiki)