Read manga: Faster Than a Kiss

manga
Summary:

After losing their parents, Fumino and her brother hop from one relative to another. Getting tired of all those moves, she finally decides to quit school and work to support her brother on her own. As they sat on a park bench, her teacher appears in front of her and agrees to her demands of marrying and supporting both her and her brother!! Is he serious or just playing around...?!
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Also contains the oneshot called Tsukio to Himawari in vol. 1.