Seiki was currently living with his in-laws.
With the current situation, his days of remote work continued.

The cause of his current distress was the decline of sex with his wife.
Furthermore since multiple generations lived under one roof, it was difficult to find the timing to masturbate.
...In that case, the only choice left was to do it while he was working.

But in middle of the act, an unexpected visitor arrived.
Manae, his mother-in-law, who was supposed to have gone shopping.
And thus, without even having the time to fix his appearance, he was seen.

[Translated from Official website]