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！, Swimmy Together!); COMIC X-Eros #79
6. Motto Swimmy! (もっとSwimmy！, More Swimmy!); COMIC X-Eros #83
7. Manabu Obocchama wa Shishunki (学お坊ちゃまは思春期, Master Manabu Has Hit Puberty); COMIC X-Eros #53
8. Himitsu no Jikan (ひみつのじかん, Secret Time); COMIC X-Eros #56