Kekkon Shiyouyo!

Original: 結婚しようよ

Keitaro is a divorcee who needs to re-marry quickly or be faced with losing custody of his son to his ex-wife. Keitaro then meets Miwa who needs to find a new home for herself and her younger sister, since losing theirs to a flood. Keitaro and Miwa decide to strike a deal to help each other out.