Cheerful Ayumu Otogawa and shy Chiaki Shiraishi.
Their personalities could not be more different, but they have
naughty park playtime with the protagonist in common.

At first he's low-key. A touch here, a peek there.
He grows more daring.

Have your fill of a loli's sweet spot buzzed while straddling the seesaw,
her prone body wide open to fondling as she hangs from the monkey bars,
and other inappropriate situations at the public koen.

[From DLsite English]