Tayu Tayu

Imagine being in an isolated area with your being the only man surrounded by numerous pretty women. Both of the harem anime explore that ideal. While Tayu Tayu takes place in a small isolated village, Boy Meets Harem takes it to an extreme by placing the cast stranded on a deserted island. Both are pretty vanilla, and feature some minor yuri.  

Two incredibly attractive sisters fall in love with their brother. While Baku Ane focuses solely on the protagonists relationship with his sisters, Tayu Tayu branches out into other girls as well. 

Both feature two sisters fighting over who gets the affection of their little brother. In both, one of the sisters is strong-willed and a bit tomboyish, while the other is mild-mannered with nadeshiko qualities. Swing Out Sisters focuses solely on the protagonist's relationship with his two sisters, while Tayu Tayu (which still focuses primarily on the siblings) is a harem.  

Both have similar art style and animations. And both contain a vanilla and harem story. 

Guy comes to the countryside for a visit; ends up having sex with the cute girls there. "Childhood friends" is the main excuse.