HUNTC-533 Kaho Hanamori, Yuna Hinata

Starting this year, the third Sunday of June has become "Brother's Day," a once-a-year event! Even sisters who usually fight all the time and have a bad relationship must do whatever their brother says on this day out of gratitude! So, naturally, you can have as much sex as you want with your sister! Even if your parents catch you having sex, instead of getting angry, they'll praise you, saying, "What a thoughtful and good sister you are!" It's the perfect day to get revenge for all the resentment you've had towards your sister! All that pent-up...