Shiawase no Kanzume

Shiawase no Kanzume summary:

In A Can of Happiness, Emi wins the special prize in a raffle, which turns out to be a can that supposedly holds happiness. There's even a weird little man who starts following her around, claiming he's the "god of the can" and trying to give her advice. But all she wants is for her relationship with her boyfriend to feel less like a one-sided crush. Will this can really help her be happy? Includes four other short stories: Boys Just Don't Understand, A Million Words, The Opposite of Love Is Hate, and I'll Always Be Here.