Matsu Tamako, a 26 years old OL started swimming at a sports club to lose weight. There she met a synchro, bony and sexy coach named Kamata. Let the brand new person emerge from the water, good-for-nothing OL!
Synchro Onchi! has finished publishing and it has 27 Chapters. It is also Known as: シンクロオンチ！, Synchro Onchi!
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