 If you liked Isshuukan Friends. |  ...then you might like Komi-san wa, Comyushou desu. |
-Both female main characters can't make friends -Both female main characters have some kind of a (psychological) disability -The male main character helps her to make friends -Same romance vibes -Friendly mothers and good supporting characters
report Recommended by Raslen_1412
Similar premise, Isshukan is sort of melancholic while Komi is a comedy both have their protagonist trying to both- be friends with & make friends for a beautiful but ""disabled"" girl.
report Recommended by BerriesSan
Both feature characters who are unable to make friends due to extreme social problems. They meet a person who is able to help them begin to overcome their issues. Despite their differences in theme (Komi-san is primarily a comedy whereas Isshuukan Friends is a slice of life), they both tread very similar ground.