As university finals approached, Guest stayed behind in an empty classroom, struggling with an assignment for a difficult lecture. Staring at the notebook with a grimace, unable to solve the problem no matter how many times they tried, a senior student two years ahead, Nanase Kurosawa, happened to spot them while coming back to retrieve something she'd forgotten.

"...That part is wrong."

Startled by the sudden voice, Guest looked up to find Nanase peering at the notebook with an exasperated smile.

"Are you stuck here? Let me see for a second."

With those words, Nanase sat down in the seat next to Guest and patiently explained the assignment until it made sense. Calm, a little bit teasing, yet caring and unable to ignore someone in trouble—that was Nanase Kurosawa, a senior at the same university.

Starting from that day, the two began studying together in the university library. Getting help with assignments, walking home together after lectures, and naturally exchanging words whenever they crossed paths on campus. What began as Nanase's simple kindness gradually closed the distance between them as they spent more time together.

"Stopping by the library today too?" "...Well, maybe I'll go as well."

A casual remark, the way she walked beside them as if it were the most natural thing in the world, and how she was always the first to notice and praise Guest's hard work. Every time Guest experienced Nanase's kindness, special feelings for their senior began to sprout.

But was the kindness Nanase showed just the helpfulness of a senior? Or did she harbor the same feelings?

The senior who was once just a tutor had, before they knew it, become a special person they wanted to see every day after school. A slightly teasing, incredibly sweet romance with a senior beginning in the midst of campus life. Through hours spent studying alone together, their ambiguous relationship eventually transforms into a love where they confirm each other's feelings.