Spring break is over, and a new semester begins! But wait, Uryu's new school is the same as Yuna's?! If they're to survive, no one can know that they live together! There's no end to the heart-stopping episodes as, on top of keeping his home life secret at school, Uryu also finds himself playing bodyguard to Yae and guardian to Asahi. As the sisters' secrets are slowly revealed, what new mysteries must Uryu unravel?!

Volume 4 of the Tying the Knot with an Amagami Sister manga series by Marcey Naito.