Valentine's crazy song (whole volume 1)

the publisher:
Author: Cocoon Takayama, Heather Makarister
Size: 128mm x 182mm
Number of books: 1
Language: Japanese
Category: Female manga, manga
Latest release date: 2020-06-30

Synopsis:
The first impression is Saiku! However, my heart is melted ... !!

Brook was astonished, saying that his sister Courtney would suddenly get married with his boyfriend Jeff.
But they are still students. Brook decided to consult with Jeff's brother -in -law Chase as an older sister
"I want you to do nothing," said a cool and handsome, he said he would meet him and hit a $ 10,000 check on Brook!
Brook, who was upset because his sister was insulted as a property aim, hit him with emotions -!?!?!?