Shiraishi's supposed "Best Friend" has been able to seduce him successfully for six years since they were in high school. They appear to be identical in their daily routines, traveling to work together, choosing the same music, and ordering the same sandwiches for lunch. Despite the unconventional nature of their bond, it has remained steady until now. However, following Shiraishi's recent divorce, it's conceivable that the situation could change, and he may succumb to his friend's pursuit.
Extra Story: One Plus One Plus One.
