59811
"来てXまった" What is the X in following image? Whole context
:[https://www.pixiv.net/member_illust.php?mode=manga&illust_id=69471473](https://www.pixiv.net/member_illust.php?mode=manga&illust_id=69471473)

[![来てXまった](https://i.stack.imgur.com/9sqDs.jpg)](https://i.stack.imgur.com/9sqDs.jpg)
CC BY-SA 4.0
2018-06-30T11:59:03.790
59810
2018-06-30T12:49:35.873
2018-06-30T12:49:35.873
27768
27768
question
kana
This is a macron or a kana?
It's the hiragana character し

> 来て **し** まった
CC BY-SA 4.0
2018-06-30T12:12:06.463
59811
2018-06-30T12:12:06.463
20479
59810
answer