Days with My Stepsister, Vol. 5 (manga)

Now aware of their feelings, Yuuta and Saki are still unsure whether the affection they have for each other is familial or romantic. To find out, they decide to try deepening the bond between them, unbeknownst to their family and friends. As Halloween approaches, will those secret, uncertain emotions develop into something more…?

Volume 5 of the Days with My Stepsister manga series by Eriko Sugita.