Editor Hatsune's new picture book author "Ui-sensei" was Mikado, whom she dated in junior high school! For Hatsune, Mikado is her first love and her first boyfriend. When you meet someone like that again, you can't help but be aware...!? Two people who broke up naturally without even kissing, doting and redoing everything they couldn't do 10 years ago! 編集者の初音（はつね）が新しく担当することになった絵本作家の“うい先生”は、中学の時に付き合っていた御門（みかど）だった！　初音にとって御門は、初恋で初カレ。そんな彼から「やり直したい」と迫られて、意識せずにはいられない…!?