After letting her reclusive sister try a dating app… Arima Miku AMBI-207

Miku, a shut-in younger sister with a strong attachment to her brother. Worried about her future, her brother suggests she try a dating app. Miku bravely meets a man, only to be unfortunately deceived by a villain. Heartbroken by the hurt he feels for his beloved sister, the brother vows never to leave her again, and the two comfort each other as if confirming their deep bond.