Need help looking for a manga

[Lil_Daemon]

So about a few months ago I seesaw and read about a manga where the MC who has a twin brother decided to send a love letter to his crush, upon meeting her he met her twin sister.. the two later agreed to help each other out on getting the other in a relationship with their siblings...
if anyone knows please post it, I’ve been getting headaches looking for this now

 

[Rutho]

I think its this
https://mangadex.org/title/49329/parasol-alliance

 

[Lil_Daemon]

Thanks a lot, I appreciate it King