https://www.dlsite.com/maniax/work/=/product_id/RJ01243875.html

[Synopsis]
A pure love story between the protagonist Haru (a teacher) and the heroine Mika (a student).
Mika is in love with her childhood friend Haru.
The two have always been together but when Haru moved out and became independent, they became estranged.
Mika makes a surprise entrance into the school where Haru works but Haru tells her that she is not allowed to have any contact with him until she graduates.
Mika complains, but accepts, under the promise that she will take him to a place of her choice after graduation.
Mika fulfills her promise and the place she requests is Haru's room.
At first, they spend the time peacefully playing games but gradually Mika can no longer bear it... ( ͡~ ͜ʖ ͡°)

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