Hoshizora e Kakaru Hashi starts off with a memory of making a promise to a girl.
Our protagonist, Kazuma, moves into Yamahiko with his little brother, Ayumu, partly because of Ayumu’s poor health and their father’s job.
Ayumu’s hat gets stolen by a monkey while they wait at the bus stop. Being the big brother he is, Kazuma chases after the monkey. He gets back the hat, but gets lost and runs into Ui, who helps him go back to the bus stop.
Kazuma falls down while crossing the river and accidentally kisses Ui.
Ibuki catches the couple and threatens to get Kazuma arrested. Of course, Ui explains everything and Kazuma finally finds his way back to the bus stop.
Kazuma and Ayumu gets to stay in an inn with Senka (current owner of the inn), who is very sensitive about her age.
When Kazuma prepares himself for a bath, another incident happens that prevents him from getting married anymore.
Senka plays a prank of the brothers. Of course you have to protect your little brother’s innocence first!
At night, Ayumu comes to Kazuma’s room and asks whether they can sleep together for the night.
The next day, they go to school- and look at who’s there!