Nagi, having woken up after noon for all of spring break, resolves to rid herself of her hikikomori lifestyle. After Hayate accidentally breaks his cell phone, Hayate and Nagi go shopping in Shinjuku to replace it. Nagi gets lost, although she vehemently denies it, and is directed to the lost child section of the electronics store. Nagi challenges the boys there to a duel with the Hayate the Combat Butler Trading Card Game; she wins and tells the boys to call her "boss", after which Hayate arrives to pick her up. On March 29, Sakuya reminds Hayate that her birthday is on April 3. Knowing that Hayate cannot afford to buy her a present, she asks for a good laugh. In an attempt to learn how to be funny, Hayate forces himself to try and jab at Maria but instead trips and face-plants her chest. Nagi beats up Hayate as a result, and Sakuya gets the laugh that she asked for, although she tells Hayate that she still expects something on her actual birthday.
春休みに入り、ナギは壊れたハヤテの携帯電話を買いに二人で新宿西口の家電量販店へ。金銭感覚の圧倒的なズレを見せつつ、店内を物色するナギ。そんな中、ハヤテが携帯電話を購入している一瞬の隙にナギはすごい勢いで迷子になっていた。そしてナギが行き着いた先、それは地獄のアヴァロンこと「迷子センター」だった…。
С началом весенних каникул Наги и Хаяте отправляются в магазин электроники у станции Синдзюку, чтобы купить новый мобильный телефон для Хаяте. Наги, демонстрируя полное непонимание цен, начинает осматривать товары в магазине. В этот момент, когда Хаяте покупает телефон, Наги неожиданно теряется. В итоге она оказывается в «Центре потерянных», известном как адский Авалон…
