Yup gets transfered from NY to Japan, he is staying with his family's bosses kids. One older teacher, two high school twins and a kindergarten baby. He starts to enmeshed himself in their lives becoming part of the family. Both twins seem to start developing feelings for him. He must choose but he might risk his new found family by choosing one over the other one. In the end he mks his choice and continues with their family life.
Tenjou no Shita ni Koi