Fukaya unexpectedly becomes romantically involved with the serene and stunning Fujino, but his insecurities are sparked by her constant companion, a vibrator. Doubts cloud his mind as he questions if her feelings for him are as mechanical as the device she holds dear. Their unconventional connection blossomed from a peculiar encounter on a packed train, leading to intense intimacy overshadowed by his fear of being replaced by the gadget. Their next outing to a pool promises a brief respite from the vibrator's presence, yet Fukaya remains apprehensive about the unknown twists fate may have in store for their relationship.