Follows Kyuuichi Shinogi, a male biology student who lives in an apartment near a helpful female neighbor/friend, Ayaka Takarai. One day, he is visited by aliens who demand that he raise their baby for a year... or else the world is history. The baby is apparently human, and is raised the way humans are: through breastfeeding. Kyuuichi's sex is not a problem for the aliens: they give him a simple device that switches his body to a woman's with the mere touch of a button. Conveniently, Kyuuichi's female form is very well-endowed. Although she's understandably confused and uncomfortable by the whole situation, Ayaka helps Kyuuichi out as he navigates the unfamiliar experience of raising a child - and breastfeeding it in particular.
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