酷暑就是要來點冰冰冰！！！讓最可愛的冰淇淋們讓你涼一夏。各種口味任君挑選，繽紛你的每一天～

Set in a convenience store that seems to be everywhere, through the appearance of a convenience store clerk who does not talk properly, while raising problems with the way of modern communication, we will approach the secret of the mysterious hero Mutou. (Source: MAL News)

東京，一個夢想與渴望交織的城市。 在這個現代時代，一群繼承古老技術的忍者，在不為人知地執行任務。 人們稱他們為“討怪眾”。