Chapter 1

Encounter on a Rainy Day is of the Koi to Yobu ni wa Kimochi Warui manga series.

Plot
After a night of lustful passion, Ryō Amakusa can't seem to remember the woman who warmed his bed. All the thinking has left him feeling a bit faint. He almost falls down a flight of stairs when a hook of an umbrella catches him, and the young man falls backward instead.

The girl to whom the umbrella belongs starts to panic and apologizes to Ryō. Instead of getting angry, Ryō thanks the young woman for saving his life. But the young girl points out that Ryō looks a bit pale and asks him if he heads breakfast yet, to which he answers no. The girl scrambles through her bag and shoves her lunch box at Ryō's chest, and walks off.

At work, Ryō can't stop thinking about the mysterious who saved his life and gave him her lunch. The curiosity bug bits him, and he searches for the girl, who also wore the same uniform as his sister, Rio Amakusa.

Later that night, Ryō arrives home and meets up with his sister, who has invited her friend. Ryō locks eyes with the same girl who saved him that morning. Before Ryō or Rio's friend can explain anything, Rio's mother calls, and she goes to take the call.

The young woman introduces herself as Ichika Arima. Seeing that Ichika is his sister's friend, Ryō wants to thank her properly, with a kiss. Ichika is flabbergasted at Ryō's straightforwardness. So, Ryō suggests that they go on a date since it would be a little less intense than a kiss.

Ichika is disgusted with Ryō's proposal, and the former accidentally blurts out what she thinks about the entire thing. She quickly apologized, but Ryō doesn't care. He stands beside her, goes on one knee, and confesses to Ichika how moved he was for her kind gesture that morning. Ichika can't stop but to feel creeped out by Ryō's confession.

Luckily, Rio walks and asks Ichika how she saved Ryō.

Characters

 * Ryō Amakusa
 * Ichika Arima
 * Rio Amakusa