HEART&BLADE

Osamu, the protagonist, is a student whose family descent from a lineage of samurais and owner of a Dojo of kendo. He was studying and training at the United States, but now is time to go back to Japan. At this house, where he must protect a sacred milenium old tree, he meets a strange girl who resembles someone he met a long time ago. But his problems are just starting. His father got him a fiancee from a rich and traditional family, his blond classmate from United States came all the way to Japan after him, and his older female cousin came to help at the dojo. What is more strange, monsters started to appear in the City. Osamu must wield a sword and fight them to protect the sacred tree and his friends. [Short translation from Getchu.com]