Four Kisses, in Secret (2020)

English translation of the Japanese manga Kisu wa kossori to. (キスはこっそりと.).
Mami has just 14 days before she graduates, which means she has 14 days to confess to her crush, Harutaka-kun, before she moves away and never sees him again. Saya Yagi's one wish is to hear "that's delicious," from her boss, Ogami-kun. Hitsuji has somehow become entangled with older brother's friend, Shiro-sempai, who swears he needs her next to him to get a (totally innocent...) good night's rest. Usami can't seem to shake her troublesome younger classmate...until she finds maybe she didn't want to lose him after all. Read all four of their sweet love stories in the Four Kisses, in Secret short story collection!