The naturally unlucky Izumi-kun faces yet another day of disaster after disaster. Even on his way to meet up with his girlfriend Shikimori-san in the morning, he runs into so many troubles that he's a mess by the time he sees her. Still, the cute, sweet Shikimori-san greets him with a kind smile. But when Izumi-kun is in trouble, the lovely Shikimori-san instantly transforms into the coolest, most heroic girlfriend you've ever seen! Fun days are in store for this couple of 1000% preciousness and their chill friends as they begin their second year in high school!

Izumi-kun and his friends are busy getting ready for the school's cultural festival. Izumi-kun is working with the group in charge of making costumes for their class's display, and Shikimori-san is in the group working on decorations. They don't get many chances to talk, and when they each see the other having fun chatting with their groupmates... And then the festival begins at last. Izumi-kun is so busy his head is spinning, and this causes his unlucky nature to awaken yet again. On top of that, he's on duty in the library the next morning. The one on duty with him is Kamiya-san, whom he first met the previous year through the library committee. But she's acting a bit different today...

Shikimori-san is at the mall to buy an outfit for the first date she and Izumi-kun have had in a long time. For some reason, her older brother, who still treats her like a child, is at the mall with her. Her brother is actually quite shy around people he's never met, and before he knows it, he's surrounded by young women and unsure what to do. Shikimori-san takes him by the hand and leads him away, which reminds her of how she always used to be the one dragged around by her brother's hand.... and of the days when she didn't know what she wanted to do with her life.