The new transfer student Mikoto Urabe is weird. She falls asleep at the drop of a hat and bursts out laughing unexpectedly, and it's no surprise that fellow classmates like Akira avoid her like the plague. So when the boy comes across the girl after class, fast asleep and drooling all over her desk, he does what any typical teenager would do… and tastes it?! What's more, there's something special about Mikoto's saliva: it's addictive, and thanks to Akira's poor decision, he must now receive a daily dose to avoid withdrawal. As Akira adjusts to this new and unexpected bond, he discovers that he's not only addicted to Mikoto's spit, but to her as well, much to his confusion!