Koi Kaze, Yosuga no Sora: In Solitude, Where We Are Least Alone. Recommendations
Both have incest themes and how it is not accepted by society. Koi Kaze is done better
Both about brother and sister falling in love. Although koi kaze has less nudity and feels more like reality. Also, the age difference between characters is larger.
Both deal with the issue of incest between siblings.
Both anime show the struggles of brother and sister as they realize their budding feelings for each other and how they realize the consequences of their actions but ultimately they succumbed to their feelings.
Yep if you watch it without knowing the topic of this go ahead. Saying this yep they turn out how how it begins to seem and both are actually quality anime's too which makes it worse.
Both have incest themes to drive the story, but they are both very different shows. Koi Kaze deals with two people who meet each other, and then find out they're related, whereas Yosua no Sora focuses on siblings who were raised together and developed a romantic relationship. Yosuga no Sora has a lot less respect cause of TONS of fanservice, but I thought it was still very good. If you liked Koi Kaze and the themes of conflicting love, you'll probably enjoy the watch.