The Hiyama family agreed to host a foreign exchange student, expecting a handsome young man. Instead, they got a muscular hunk named Daniel Garcia. Through daily life, each family member grows closer to Daniel in their own way: --Yuuto, the father, improves his English skills, which helps him excel at work. --Taiki, the son, expands his social circle through his interactions with Daniel. --Chitose, the mother, regains her confidence as a woman by losing weight with Daniel’s help. But as time goes on, Daniel begins to show his desire for Chitose more openly. Chitose, too, finds herself increasingly aware of Daniel’s overwhelming masculinity… Her mature body begins to awaken to the pleasures of being a woman under Daniel’s influence. And then, Yuuto’s overseas business trip is finalized…