In the latter half of the Edo period…
a narrow tenement in the humid heat of midsummer, two men exchanging heated sighs as they have intercourse...

A former kagema (male prostitute) named Momoki was picked up by the wandering musician and occasional fireman Manji one rainy day.
The times that Manji spends not treating Momoki as a kagema, but gently holding him as a lover, are much like a dream for them.

To Momoki those days are filled with happiness, no matter what may have happened in their past.
With his heart by his side and the rest of their lives stretching out beyond them, will he ever get used to being this happy?