Yutaro Minatomo is a young 15 -year-old high school student who wants a girlfriend, but his terrible luck and shyness keep him from accomplishing his dream. One day, his crush Yumeko calls him to meet her at the top of the school. Yutaro decides to take this chance to confess his love, but he ends up shocked by what he sees at their meeting point!

The heartbroken Yutaro stops believing in love and unknowingly summons Bambina, a wonderul woman who calls herself a Knight of Love. This female Cupid will turn Yutaro's life upside down!