He Is My Ex-Boyfriend (2003)

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Toji, a manager of a food section in a medium-sized department store, has to put up with a tough boss that makes every day a real struggle. But things start to look up for him though when he meets a pretty elevator girl named Nao who is. Just as he is starting to enjoy a new-found happiness at work, a new account manager from an advertising agency visits Toji's division, and it is none other than Toji's ex-girlfriend from university, Makoto. Toji is surprised to see her again but Makoto treats him as if she has never met him before. Now dealing with a tough job and caught in the middle of a jealous Nao and Makoto who dumped him, things couldn't get much worse for Toji!