- It's not a harem
- Imouto is not a brokon (though I feel that that imouto fanservice was intentional)
- Cute kouhai Tomoe-chan has a crush on Sakuta, will confess in the 2nd volume and will be rejected as a result
- Mai is the main girl
- She'll start dating Sakuta in the ending of the second volume
- Sakuta is to become her husbando
- But there's a challenger: Makinohara Shouko, Sakuta's first crush
- So you can say there is a slight bit of love triangle
( like this
https://i.imgur.com/eOiITQc.jpg )
- Shouko-san will even marry Sakuta in at least one timeline
- Mai's sister seems to like Sakuta too
She's also a siscon, though
As for the other characters
- Yuuma-kyun still won't break up with Kamisato Saki ;___;
- Futaba Rio has a crush on Yuuma-kyun, but don't want to steal him from his gf.
Basically, she wants to remain friends with both Sakuta and Yuuma