We just released Sakura Succubus 5, so if you have not picked up the prior installments yet, now is a good chance.
https://store.steampowered.com/bundle/15682/Sakura_Succubus_Bundle/
That's not all the discounted games though, you could also pick up other games like
https://store.steampowered.com/app/402180
https://store.steampowered.com/app/407330
https://store.steampowered.com/app/539670
or complete your Sakura Clicker DLC collection
https://store.steampowered.com/app/383080/Sakura_Clicker/