Himawari to Hitsujitachi!  

Sunflower and Sheeps!, ひまわりと羊たち

Kazuma's life was always ordinary until one day when Himawari Sakuya appeared and declared that he was her brother and the inheritor of their family estate. Sakuya, who comes from an affluent and distinguished lineage, has arrived to take Kazuma back to their ancestral home. Along with her loyal servant Torako, they now reside at Kazuma's residence until he decides to embrace his new role as a member of the Himawari family. However, unbeknownst to him, Sakuya is being pursued by an enigmatic group.