Yuuto lives next to a married woman named Tsubaki. Their houses are so close together that their windows are almost touching. As such, they always talk through the window. To Tsubaki, Yuuto is just a little boy, whereas Yuuto sees Tsubaki as something much more... One day, Yuuto's patience reaches its limit when he sees Tsubaki in a revealing outfit, so he asks for her help to relieve his "thing." Tsubaki is surprised by his big "thing" but uses her mouth to satisfy his sexual needs. "<i>Just once...</i>" After that, Yuto can't stop thinking about her tongue... Then one day, he hears her moaning from the window over...