Good Luck! Ninomiya-kun

Shungo is surprised to learn that the new girl at his school, Mayu, and her brother, Mikihiko, are his new housemates. But, surprise! Mayu is an androphobic succubus and Shungo is tasked with helping her overcome her fear of men.

Mayu unknowingly insults Reika upon meeting her, and Reika can't let it go. After Mayu's brother proposes a high-stakes contest to resolve the problem, Reika simply can't back down from the challenge.

Hinako invites Mayu out on the town to get to know her better, and Reika puts her "get-rid-of-Mayu" plan into action. Will Shungo overcome the obstacles to reach Mayu in time?

When Shungo leaves for training, Mayu tries to help with some of the cleaning duties but only manages to make things worse. While trying to fix her mess, Mayu discovers a secret passageway and the girls end up in quite the predicament.

Reika spends the entirety of their beach vacation trying to one-up Mayu, but a relaxing trip turns into a nightmare for the group.

After being kidnapped by mysterious soldiers, Shungo, Reika, and Mayu try to escape. Who is behind this, and what is motivating the woman in the tiki mask?