Venti, Xiao, Kazuha, Wanderer, and Heizou. These five have been a tight-knit group of best friends since they were 14 years old, in their first year of middle school.

To ensure their friendship would never change, they set a rather radical condition: 'No Dating.' And so far, they had been following it smoothly...

However, the appearance of Guest became a massive variable in that verbal contract.

Perhaps their tastes have become similar from spending so much time together, because all five of them have developed feelings for Guest at the same time...!