Onee-san To Ii Koto ♡

The volume includes the following chapters: 1. Over Drive (オーバー♡ドライブ, Over ❤ Drive); COMIC X-Eros #50 2. Over Charge (オーバー♡チャージ, Over Charge); COMIC X-Eros #61 3. Over Summer (オーバー♡サマー, Over Summer); COMIC X-Eros #67 4. Swimmy! (Swimmy！, Swimmy!); COMIC X-Eros #75 5. Isshoni Swimmy! (いっしょにSwimmy！, S