Marika Kato, wophunzira wa chaka chachitatu pa Hakuoh Girls' Academy, ndi wachifwamba wovomerezeka wa mlengalenga wokhala ndi Letter of Marque. Pakati pa maphunziro ake, kutsogolera kalabu ya yacht ya kusukulu yake, kugwira ntchito kwakanthawi ku Cafe Lamp, komanso kukhala woyendetsa sitima yapamadzi yotchedwa Bentenmaru, masiku a Marika amakhala otanganidwa kwambiri. Tsiku lina, Marika adapeza ntchito yobera sitima yapamadzi yokwera kwambiri, ndipo adazindikira kuti pamndandanda wokwera pali Kanata Mugen, mnyamata yemwe ali ndi "mlalang'amba". Motero, ulendo wosonyeza mpikisano wothamanga pakati pa achifwamba ndi mnyamata wina wachichepere umayamba.
