The Premium Tournament on the Second Floor
Hiroe Hannen is the mysterious resident of Temari Heights apartment 202. When Hana goes up to deliver a package for her, paranoid Hiroe mistakes Hana as a suspicious intruder. Her misunderstanding is straightened out with Shion's introduction, but it soon becomes clear that Hiroe is a shut-in, who cannot step out even to the convenience store. Her high school years were smooth sailing until an accident that became a turning point in her life. Hearing Hiroe's personal story resonates with Hana, who then shares her secret of being a year behind in high school.
Aired 28/01/2018EP 4 - The Premium Tournament on the Second Floor

Slow Start
The story centers around 17-year-old Hana Ichinose, who unbeknownst to her classmates, was a year late in enrolling into high school. Although it may not seem like a big deal, it is a big deal to her. She wants to catch up with everyone else someday.
(Source: Anime News Network)