My Sweet Girl, Volume 12

During the Christmas party at Masamune's house, Koeda learned that Masamune's parents are remarried and that Masamune isn't blood-related to his dad. Masamune himself said that he wasn't concerned about it, but he's been acting a bit strange… Koeda wants to help Masamune, but he turns her down, saying, “I don't want you to see a disappointing side of me”…?! What can Koeda do to open the door to Masamune's heart…?! Currently a super popular series in Bessatsu Friend!! It's one awkward girl in love's pure☆slow step love story - volume 12?