She's Adopted a High School Boy! Vol. 5 (Kodansha, 2021)

""If you're happy, I'm happy"" is the motto of the next-door neighbor who paid off Minoru Soramoto's family debt and took him in, all at no charge… Where will this exciting new life with the mysterious lady lead next?! Now that Minoru's chosen the lady next door over his parents, his feelings start to grow stronger, and he finds himself wanting to tell her how he feels… Meanwhile, things get exciting during a class trip (the lady invites herself along) and a Christmas party. Feel the heat rise between the two as they explore their innocent feelings!