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. "Just once..." After that, Yuto can't stop thinking about her tongue... Then one day, he hears her moaning from the window over...